I had a go at playing the Flames of War "A Bridge Too Far" campaign system the other night. We (me, Shaun and Tom) played the historical version. This involved me trying to take the bridges from the Germans. The system involve declaring moves which result in several simultaneous battles. It is complex, covering things like supply routes, terrain types etc. For instance
You really have to think about what units to advance with. Shermans do well to reach the bridge areas, but are the a bit vulnerable in towns, so you need to bring other units for support. There are also aircraft to consider for ground support and supply drops. Also, there are reinforcements and the fact that some unit strengths are unknown until encountered (i.e. roll a dice to see if they are elite troops or just a sentry with a dog!).