Liberty and Rheinland frequently attack each other in Hamburg, Texas, and New Hampshire. Currently in the war, Rheinland is mostly on the defensive, they have destroyed jump gates to stop Liberty's advance, but now that Liberty is aiding Bretonia against Gallia they have pulled forces out of the Rheinland front which allowed RM to advance through New Hampshire and get a foothold there.
They are also fighting over the research station components in that area.
And the forces can go and attack the other side whenever they feel like it really, just remember the ZoI stuff on the ID. Capital systems are generally off limits, and the other military is getting in bad territory if they attack people outside of their ZoI
