Actually, it has an attack of 6 + (6 x 3 / 4) (rounded down) = 10
Before the MA it was 6 + (6 x 3/ 6) = 9
How can you tell? Just attack with a Cav, and when it is defeated, reload and attack with the Army instead. Of course, the pRNG can also kill the Army, but for the most time you'll notice the difference.