Sentry

My sentry is lying in a scrap heap
My greatest work is no longer functioning
It was destroyed at night, I was asleep
When a spy came out and destroyed the thing

I loved that sentry like it was my son
That cloaked devil sapped it catching me off guard
He stuck a sapper 'pon it, ruining my fun
My sentry's short life will never by marred

I'll have my retribution on that spy
He made me miserable and now he'll rot
I'll do the best I can to make him die
With my revenge I'll give him all I've got

My practical problem has ceased to be
I have defeated my adversary