[Ynglaur]

Rifles can be surprisingly well balanced when it comes to bayonets. Then newer M4 carbines aren't that great, especially when you throw on combat optics, laser sights, flashlights, etc., much less a grenade launcher (M203). But even the now-venerable M16 can have a good combination of blunt and edged attacks, and can be surprisingly nimble.

The problem in trenches in terms of hand-to-hand combat is definitely one of lack of space. I, too, think the Agarthans' use of short swords makes a lot of sense thematically.