Its the "Village Maidens" they walk around the village making sure everything is checked on every few minutes, they like the trees, they like the mushrooms, they like the Wizard Towers and the TH.. next time you set out to raid, wait 10-29 seconds before you launch your attack and watch the village maidens. (can also be done on your own village before you leave for attacks) once you do launch your attack, the maidens and the builders all head for the TH...
Under the TH is an underground network of tunnels and pathways that the maidens and builders use to supply the rest of the defense turrets with ammunition.
