Looks like I found the crash bug in the Army Skirmish servers. It was in the server-side "Attack Ground Order" code.
I will put up about 5-10 of them so you guys can try that gameplay mode out online.
Some of the servers will be only 1860s units, others will be mixed.
Army Skirmish mode is the one where you can build your armies, etc.
I'll let you know when they are up.