Commander..With so many boost/buffs available to both Offense and Defense units it makes answering your question a little difficult..It is possible that the attacker had 1 or several of these boost activated,,,Exec/ Status..10 % ( depending upon your Exec.Status level )  10% Offense enhancer..20% Offense enhancer,,or the 50% Defense and Offense enhancer for 7 days .Where as the amount of your lost units do seem like to many,,The boost/enhancers can level out qa playing field in quick order