Let's say that a tank gets shot enough times to put it out of action, whereas with most releases this would be the end of things, but other games like Company of Heroes keep it going.
Yet, the differences here stem from the level of detail and control present in these games. You command them one by one, and try to overcome a much stronger enemy which is facing you down.
You have troops, tanks, artillery pieces and even aircraft to call upon as needed. Many qualities and ideas found in these games are the sort you'll be familiar with.
Games like Company of Heroes seek to subvert this usual trend, Rather than something to be preserved or valued, they're either there to get in your way, or to die in droves so you can accomplish your victory. However, all too often the troops in question are treated like mere fodder.
From ancient generals leading their troops from the front to sitting back and executing a well planned attack from bunkers, games have experimented with them all. Commanding troops in war can be done in many ways.