Quick Question: What is sapping?

[Plucesiar]

I noticed some units have the ability to sap, but what is it?

Thanks.

[Indylavi]

Sapping is the ability to dig under enemy walls to collapse them. If you set a siege you will be given options of what you can build. A siege tower, battering ram, and a sapping point. Sorry can’t remember the name of it right now. Any unit that has a sapping ability will be able to dig under the wall and collapse it

[sapi]

it's just called a sapping point

[El_Bufon]

Sapping is being a total dork head when trying to impress your mates girlfriends. ~:)

[The Tuffen]

sapping is quite useful, unless you do what i did and that was to start sapping a wall and the send my men with the ladders to the same wall. Thankfully i got most of my men on the wall away from where it collapsed but i lost about a 1/3 of my unit