The term 'ATTACK SUDDEN' can be broken down into three crossword solutions: POUNCE (6 letters), RAID (4 letters), and FORAY (5 letters). POUNCE is an action that involves quickly leaping or pouncing on something, usually to surprise it. RAID is an action that involves a sudden attack by a large group of people, usually with the intent of stealing or destroying something. Lastly, a FORAY is a sudden attack or invasion, usually with the intent of taking something away. All three words are related to the idea of a sudden attack, but each has its own nuances.