It disables all buildings in a small area for a short period of time. Tower buildings will not shoot, while defenders spawning buildings will not spawn defenders. This includes City Center and Fort (Castle).
Even if a Decoy is placed, the buildings under Sabotage effect will not spawn defenders.
Battle Tactics, Chapter 1 will increase the duration of this tactic by 20%.
Leonardo da Vinci's 'Sabotage Duration' by 30%, as 10 increments of 3%.