what is that noise?

I am trying to get my infant to sleep, feeding her the last meal of the day, rocking her in my arms. My husband is having a meeting downstairs so I try to hum softly as I rock my baby. In the middle of the attempted peace I hear repetitive banging. I am not talking about a thump or bump, but loud echoing banging that resonates up stairs. Calmly as I can, I finish with my baby girl and head downstairs to find the source of the noise. I find my two oldest boys, 11 and 9, in their brothers room with a large metal bat. The are banging the you know what out of my younger son's unsuspecting toys. At this point, I realize it doesn't matter how durable these toys are built, nothing can withstand my children.