Is there a single word for reasoned action?
Solution 1:
Stratagem:
an artifice or trick in war for deceiving and outwitting the enemy.
(Source: Merriam-Webster)
Solution 2:
Strategy
A careful plan or method.
Another option:
Gambit
A planned series of moves at the open of a chess game
A calculated remark intended to start a conversation or make a point
A calculated move
(Definitions from Merriam Webster)
Edit: adding another
Rout
An overwhelming defeat - or to defeat overwhelmingly