This tip will make an attack without 'attack'. This is the condition - If you play 
against computer, you have a neutral tribe, you have an ally that currently on a war
with that neutral tribe. If ye want to help your ally do this. Create a group of five
villager, upgrade the Loon tech., create university, advance the Fortified Wall, and
gather stones as much as possible. Send the Villagers to the ally base and create 
Fortified wall nearby the Neutral's building, create 5 or 3 is recommended! If your
'just made' wall is attacked it's the main purpose! The next door building will be 
affect as well. While they're attacking their own building, create some more 
Fortified Wall beside the another building, eg. Monastery, or even Town Center!
-NoCheAt-