Grenade
The term commonly refers to the German "Stielhandgranate"-style grenades introduced in 1915 and extensively used in World War I and World War II for trench and urban combats , by the Central Powers and Nazi Germany , while the Triple Entente and Allied powers typically favored the more traditional rounded grenades . 
<triplet> Stielhandgranate <subj> 1915 <obj> service entry <triplet> Central Powers <subj> World War I <obj> participant in <triplet> Nazi Germany <subj> World War II <obj> participant in <triplet> Allied powers <subj> World War II <obj> participant in