We have taken many 'defensive' measures [=we have done things to protect ourselves] against terrorist attacks.
The team needs to improve its game 'defensively'. [=it needs to make its defense better]
He found himself 'on the defensive' when the subject of the environment was discussed.
(..) I saw something. No blood, no bodies. We hit nothing. Dillon, better get on the radio. Mac. - Sergeant. - Yes, sir. I want a defensive position above that ridge mined with everything we've got. - Put him in his poncho. Take him with us. - I got him. Major, I set up flares, frags and claymores. Mac. (..)1987 Predator