The Roman Empire never faced a 'world war' - not even one within the confines of the Empire. They fought individual wars, one at a time and never faced any one enemy in more than one 'theatre of war'.
One can find a list of Roman legions from a variety of places. Wikipedia, UNRV History, Livius, The Org, and many other websites provide a list of Roman legions.
There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.There were many more than 29 Roman legions. The exact number is not known as some were formed for a specific purpose and then disbanded or absorbed into other legions. After Actium, Octavian was stuck with having to pay at least 45 legions as Antony's legions defected to him, plus the legions stationed on the European borders. In his book, "Legions of Rome", Stephen Dando-Collins traces the history of 44 known Roman legions.
Allegedly at the height of Roman Power there were four elite legions... under Julius Ceaser. The correct answer to this question would be... Nobody knows exactly
The Roman legion had 10 cohorts. Nine cohorts (cohorts 2 to 10) had six legions. The first cohort of elite soldiers had five double size legions. This makes a total of 59 centuries. It also gave a total of 5,120 infantrymen as a legion had 80 men and the five double legions had 160 men. These are loose numbers, as a Roman legion was rarely at full strength.
There was no set number of legions in a Roman army. The number of legions in an army was the number of legions given to the general. Some campaigns only needed one legion while others required several. They were both armies.
During the reign of Augustus (27 BC-14 AD) the Romans had 25 legions and about 125,000 men. Under the reign of Septimius Severus (193-211) there were 33 legion and about 18,000 men. The Roman legions were army corps composed by Roman citizens. They were supplemented by regiments of auxiliary troops which were composed of non-Romans. These troops were equal in number to the Roman legions. Therefore, the total size of the army were double the figures mentioned above. Caracalla (reigned 211-17)extended full Roman citizenship to all freeborn men in the empire. This led to the integration of the auxiliaries into the legions.
During the reign of Augustus (27 BC-14 AD) the Romans had 25 legions and about 125,000 men. Under the reign of Septimius Severus (193-211) there were 33 legion and about 18,000 men. The Roman legions were army corps composed by Roman citizens. They were supplemented by regiments of auxiliary troops which were composed of non-Romans. These troops were equal in number to the Roman legions. Therefore, the total size of the army were double the figures mentioned above. Caracalla (reigned 211-17)extended full Roman citizenship to all freeborn men in the empire. This led to the integration of the auxiliaries into the legions.
The ancient Roman legions were almost always fighting inasmuch as the Roman empire was so vast, there was frequently a border problem or a revolt of conquered peoples that required the intervention of the legions. With this in mind, there many years in the duration of the empire where no major wars or battles were taking place. Rome was a successful empire largely in part to its military power. To maintain a military that was always ready for action, the legions did maneuvers, went on long training marches, practiced building their famous night encampments, patrolled the borders of the empire and did maintenance work on roads and bridges. The legions strengths were to always be ready for war even when no wars were in sight.
"Legions" typically refers to a large group or multitude, often used in historical or military contexts, such as the Roman legions. In contrast, "several" denotes a smaller, indefinite number, generally more than two but not many. While "legions" implies a vast quantity, "several" suggests a more moderate amount. Thus, the two terms convey different scales of quantity.
The number of legions depends on the period.Some legions where destroyed in battle, example: Legio XVII, Legio XVIII and Legio XIX where destroyed in the Teutoburg forest and the Aquila* standards were lost - they were never rebuild.Some where disbanded in disgrace, example: Legio I Germanica disbanded for cowardice in the Batavi revolt.Legions were raised for war and the Roman Emperors created new legions as part of their rule as well.We know that Augustus disbanded more than half of the 50+ legions in existence when he became emperor, the 28 remaining legions became the core of the army in the early empire (ca 30 BC - 284 AD), we also know that 46 different named legions existed in the course of the early empire.But the total of legions at any given time is hard to tell.*eagleRead more: http://wiki.answers.com/How_many_legions_were_there_in_the_Roman_army#ixzz1MJF7DRCL
The ancient Roman legions were extremely successful in wars. Their legion formations were unique in the ancient world, and their design often defeated many nations and enemies of Rome. Rome was also excellent in siege tactics and in building fortifications. Much of the Roman success was based on strict discipline, and practicing maneuvers even when there were no wars at hand. Ancient Rome was also excellent in building forts and weapons like spears that when thrown at an enemy, could not be thrown back at them as their design was to collapse the head of the spear.
Between 60,000 - 96,000 based on a Roman army usually having between 5000 - 8000 soldiers per legion.