There is a 30 minutes guard given free, if you survived the attack from your opponent. This will give you a free attack on your opponents while your town hall still has the shield.
I made use of the guard while I go to loot the gold, elixir or dark elixir from my opponents. This will help me to expand my town hall.
Clash of Clans users can now attack other gamers base during their shield time. It will not remove their shield unless your shield time is less than 3 hours.
You will lost 3 hours of shield time with every attack. If you have 12 hours of shield time, you will be left with 9 hours after attacking a gamer base. This is perfect for gamers that are looting resources.