Generally ground combat really isn't that different in plot from starship stuff.
Force A meets Force B and attempts to inflict enough casualties to cause Force B to break off their assault. Force B tries to inflict enough casualties to break through Force A with enough remaining units to continue the assault on their real objective.
Force A attacks base/installation in Force B's territory. Force B defenders respond and attempt to destroy or drive off Force A. Force A needs to defeat defenders as well as do significant damage to the base/installation.
Patrol of Force A along contested border areas to watch for reprisal attacks from Force B yet is ambushed by Force B.
Force A is escorting important prisoners of war from Force B to a secure rear area facility when attacked by a rescue team from Force B.
Off the top of my head in general terms.