Check out GritEcon mod.
http://imagemodserver.mine.nu/other/...Mods/GritEcon/
It has infantry, tanks, and artillery. Infantry do piddly damage, but have tons of hit points. Artillery do must more damage, but have piddly hit points. Tanks do less damage than artillery and have fewer hit points than infantry. You need infantry to soak up damage, but you need heavy vehicles to do any real damage.