An intriguing piece David, it's part of the same series as mine. I wonder what the relationship is between them. Where were the Chatti, along the Rhine? I forget, have to check a map.
The heartland of their territory was 40-50 miles
north of the Rhine, but certainly the river forts must have been threatened in some capacity.
Domitian had the legionaries build roads into Chattan territory in order to reach their hilltop strongholds. Not much is known about the conflict and it didn't have a culminating major battle ala Mons Graupius or Tapae. It's likely mopping up operations continued for many months after the initial hostilities, perhaps ending not long before these coins were issued in 85.