Yes, Unity of Command is one of the best light wargames ever created. It's all about supply; balancing the need to advance quickly to capture the objectives within the uber-optimistic schedules vs needing to protect your supply vs. not wanting to outrun your logistics vs. trying to surround enemies and easily eliminate them when they're inefficient and out of supply.

The AI is excellent especially when playing the defense (which is nice, since for the human playing the attacker is the more interesting role). It's great at noticing when the player has overreached and mercilessly punishing those mistakes.

I can't recommend it highly enough if you have any interest at all in wargames. It works as an entry level game, but is also deeply satisfying for the grognards.