A staple of modern soldiers from World War I to the present is the grenade thrower. Most sets of Army men have one. Usually, he is poised to throw. The arm holding the grenade is cocked back; his free arm points forward toward the target. American and British, throw a grenade that is shaped like an egg or a ball. Russian and German soldiers are generally depicted with a stick grenade that looks like a potato masher. The Japanese can be armed with either.
By the 20th Century, a more reliable fuse was available. Grenades were used for clearing trenches. Two methods of projecting grenades were available. Hand grenades were made to be thrown. Rifle grenades were launched, using a rifle as the launcher. The common type of grenades were fragmentation and concussion. Egg-shaped grenades were made to break into shards as they exploded. Stick grenades relied on concussive force rather than fragmentation.
Here is a link showing the grenade throwing used by various armies: http://www.thortrains.com/getright/drillgrenade1.html