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airplanes
To break through the enemy lines
You earn enough XP. You can do this by killing enemy units.
The phrase 'going over the top' - referred to the soldiers in the trenches climbing out and up to flat ground, and advancing towards the enemy over 'no-mans land'. Attacking the enemy's trenches~APEX
Germany was Britain's main enemy.
airplanes
Sonar
Trench warfare was mostly used, and planes were used to locate enemy positions
Defensive weapons killed thousands of troops attacking enemy positions.
To break through the enemy lines
You earn enough XP. You can do this by killing enemy units.
Radar (Radio Detection and Ranging) was the technology developed for detection of enemy air power.
Technology during World War II opened up an entirely new door into what the enemy was doing in areas in which they were once hidden. New pesticides, nuclear technology, and jet engines made the fight faster than it had been in the first World War.
Bombing enemy positions, bridges, and cities.
destroy enemy troops or buildings etc and your level will go up.
During World War I, trenches were for the most part located directly in front of the enemy's projected line of attack. Where possible, trenches were also located to the sides of enemy positions; however, many trenches (such as those used for supply- and communication-purposes) extended backwards from the front lines.
Possessions taken from the enemy during the war. A+ C.A.C