+1 combat result per excess wound caused in a challenge, to a maximum of +3.

When a unit sees their enemy's best fighter cut to ribbons, the carnage most definitely influences their will to fight. If a character fighting in a challenge kills their opponent and scores more wounds than their enemy has remaining, then each excess wound scores +1 combat result, up to a maximum of +3.

Challenges are a special type of close combat performed only by characters, and are covered in more detail in the Characters chapter.