Called at the time the "power Keg" of Europe,the ________ was where WWl starded, when the empire of ________ attacked_________at the ____ germany was stopped by _________the war on the _______ front quickly became a ____ because neither side could advance, which in turn cases both side to dig _____However, on the _______front soldiers and armies were much more______because the battle front was very _________the conditions in the trenches were often wet and ____ for days and weeks at a time, so another enemy soldiers faced was_____ which sometimes led to loss of _______or wors. When troops lefr the trenches to attack, this was called_________ then they entered_______ where they faces deadly _________fire,________ artillery, and lost barbed _________. _________ was the first country to engage in _________warfare by using the new technology of __________which caused painful injuries______ and sometimes death, even for the side who used it! Due to more deadly artillery, the increased use of _________ on the battlefield and _______in the skies eventually lead to the _______-of trench warfare