Is spiritual warfare dangerous?

Are we involved in a war? No, Jesus Christ already conquered the enemy. Do we need to be alert like a soldier? Of course we do! Our enemy should never be under estimated. How do we do this?
We refrain from getting involved in sin.
We live holy lives.
We only keep ourselves busy with good things.
We submit ourselves to God.
We live in faith and we live obedient lives.
This way we do not give the enemy any foothold. This is manning our border-posts and this is patrolling our borders