i need to correct this:
"try and chain someone over a period >4 hours =)"
it doesnt matter how long the chain is spanned over, as long as the target gets brought down to the right size and allow enough time to overpop. for example if his army is out for 12 hours, and u chained him to 1/3 of his size over 5 hours, he still has a good 7 hours to overpop and loose troops. in fact its probably better to span ur chains a bit longer because sometimes if u wait 2~3 hours he will loose enough defense (or if he login and release some) for u to double or triple tap and consequently bring him down even lower than u would have if u hit in same hour
its far more important to start ur chaining as soon as his army leaves (if his army is gonna be back in 3 hours there is no point chaining him even if u can all hit in 1 hour)
another thing i would like to add to the list is if u r a gnome and u r far from being unbreakable, NEVER cast townwatch in war (unless u r trying to make someone bounce)!! u'll regret it