Goblin Orphans

[Tally-Ho]

Using a troop of tiny goblin children rogues, armed with a reach nonlethal weapons, pounding the players senseless and making off with their loot.
The nonlethal reach weapons i will call Bunnybashers (stockings with copper pieces inside) which break and fling shrapnel in a random direction on a natural 1.
reach allows them to flank and sneak attack.
against 6x level 1 PCs how many orphans would be necessary, given that they will have almost no HP