Colossians Chapter 2 (Col 2:1-8) covers Paul's warfare; the tactics of the enemy (Satan) and debunks rationalism (Col 2:16); mysticism (Col 2:18); asceticism (Col 2:20); legalism (Col 2:21) and other philosophies (Col 2:8) of men. Col 2:1-7 covers the walk and warfare of the believer. Our supply for battle is in Col 2:3. Our strategy in combat is outlined in Col 2:5-6. Col 2:6-7 says that our walk is simply as we've received Christ -- by Grace through faith.
Paul never met the Colossians but wrote to them from a Roman prison around 62 AD to counter misconceptions of his day. It magnifies the character of Jesus Christ more than any other book in the New Testament, and counters misconceptions of our day as well. The key verse may well be Col 1:18 "...that in all things, He might have preeminence."