Which is the greatest reason Austria-Hungary invaded Serbia? a) Austria-Hungry only invaded Serbia because they were in an alliance with Germany b) The Austria emperor, Francis Joseph, had a deep affection for the Archduke Ferdiand C)Serbia refused party of the ultimatum demanded by Austria D) Austria knew that Russia would probably now defend Serbia What was trench warfare? A) both sides dug deep trenches to protect themselves from enemy attack b) the use of ''trench'' guns to fight wars c) both sides dug trenches to form new water sources. d) both sides dug trenches to hide weapons from their enemies. answer both question correct with correct answer

Which is the greatest reason Austria-Hungary invaded Serbia? a) Austria-Hungry only invaded Serbia because they were in an alliance with Germany b) The Austria emperor, Francis Joseph, had a deep affection for the Archduke Ferdiand C)Serbia refused party of the ultimatum demanded by Austria D) Austria knew that Russia would probably now defend Serbia What was trench warfare? A) both sides dug deep trenches to protect themselves from enemy attack b) the use of ''trench'' guns to fight wars c) both sides dug trenches to form new water sources. d) both sides dug trenches to hide weapons from their enemies. answer both question correct with correct answer