Slug Destroying Army

On my way home today i popped to my allotment to check how my seedlings are doing and did a bit of watering.
Just before i left i decided to check my little pond i put in for the frog's.
Last weekend i found a large frog and popped her into my pond and i wanted to see if she had made home there.
To my surprise she had decided to lay all her frog spawn there and i will have an army of little frogs soon to eradicate all those pesky slugs over the summer.