Not to mention that the validity of the CB is not by any means airtight, nor is it the most airtight one even recently.
And even if I concede the CB, neither ConC or DBDH are obligated to defend ActTi, and Battalion certainly didn't do any reasonable amount of diplomacy to bring them into the fold. In fact, I daresay he did a worse job of diplomacy with his allies than his enemies here.