Perhaps this for Earth? It's Muse's
Time is Running Out, but an instrumental version. It starts out slow, but get's pretty good later on. Really good. It's probably better without the lyrics (for a war song). And the only reason I thought of it is because part of the lyrics are "I won't let you bury it." There was also
Dirt Room by Blue October, but it doesn't really work well for a war song.... I couldn't think of anything else off the top of my head that talks about earth/dirt/etc.
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I have some more by Pendulum but I'll wait on that.