For secret operations and attacks.
One of the first instances of lost US lives in WW1, and introduced the US to unrestricted submarine warfare; as well as a public cry against UN-restricted sub warfare.
There were a few different events that lead to WWI, but one major one was the Zimmerman Telegram. It was a telegram from Germany to Mexico. It proposed that Mexico join the war on their side, and in return, Germany would help Mexico win back it's territory from the US, such as Texas, Arizona, and New Mexico.
The Holocaust is a term used to refer to the genocide that the Nazi regime in Germany began. The intention was to purge German society of those races and people that were considered sub-standard and a drain on society. The poor, Jewish, Gypsies, Homosexuals and other groups considered sub-standard to the Aryan race were sent to concentration camps to 'clean up' the rest of Germany and the occupied countries.
During the US Civil War (aka American Civil War), guerrilla warfare (especially in the beginning of the war) was almost looked upon as a crime (much like spying, sabotage, raiding, etc.). In fact, some officers refused to acknowlege guerrilla actions, lest they be accused of condoning them. For general purposes, without at least "stringing them up" (hanging them), guerrilla warfare was at least considered "ungentlemanly like warfare." This was akin to submarine warfare which occurred in WWI; surface officers (battleships, cruisers, destroyers, etc.) considered sub crewmen to be nearly pirates and wanted them (or at least brought the issue up) hanged as criminals.
The German word 'untermensch' translates to sub-human. Untermenschen (in the eyes of the Nazis) included Jews, Gypsies, Communists, Russians, and other 'inferior peoples.'
sub tropical
Germany announced plans to resume un-restricted sub warfare; they were warned not to do it.
In almost all navies during WWII, submarines were called "boats"...not ships. In Germany, a sub was called an "under-sea-boat", with German enthusiasts preferring to use the German spelling/pronunciation of "boot" for boat. Bottom line: "U-Boat submarine warfare..." is simply submarine warfare (Sub Warfare is what most boys in America grew up calling it).
UN-Restricted sub warfare was conducted in both WWI & WWII, & in all oceans & by all major combatants (US, Japan, Germany, Britain, Russia, etc.): Atlantic Ocean, Pacific Ocean, Indian Ocean, etc. Un-restricted sub warfare simply meant, "not giving prior warning to the vessel to be sunk."
The climate zone in Venezuala is sub-tropical.
There are 5 different thermal zones of earth which are responsible for varied weather conditions in each specific location. These include, Tropical Zone, Sub-Tropical Zone, Temperate Zone, Polar Zone and Sub-Polar Zone.
The SS Lusitania was sunk in 1915. The US entered WW1 when Germany resumed "un-restricted" submarine warfare in 1917.
Worms: Open Warfare 2 is an artillery game with the sub-genre of a strategy game.
Unrestricted submarine warfare is a naval war tactic in which the submarine attacks merchant ship (or any ship not in the navy) without warning. Germany used this tactic on American vessels at the start of WW1, and that is a major reason that the US joined the war effort against the Germans.
what is narrowing of the right subarticular zone of the spinal canal
A sub-duction zone.
I Think Subs Had The Biggest Effective By Sinking The Lusitania One Of The Things That Brought The US Into WWI (There Were Also Many Other Cases Of Germany Using Unrestricted Sub Warfare )