However Oxford could not penetrate the defences and Wanderers won 2-0.

If attacking units penetrate the outer defences they can be intercepted with aircraft in ready-5 status, if used.

The one researcher who did penetrate the defences, in 2009, was able to identify 258 species of invertebrates, birds and reptiles in a few hours.

Raids from the direction of Coudehard managed to penetrate the Polish defences and take captives.

A suicide bomber managed to penetrate the defences of the police headquarters by wearing a police uniform, the Afghan interior ministry said.

A hardcore subgroup of them started to make repeated assaults in order to penetrate the defences and break into the building.

Nevertheless, solar flares are powerful enough to warp and penetrate the magnetic defences, and so are still a hazard to the crew.

But the assault failed to penetrate the defences, and the Allies were forced to fall back to their lines.

Where possible they attempted an indirect approach, penetrating the defences using infiltration tactics.

Eventually the system will reach a maximum number of targets destroyed and after this point all additional warheads will penetrate the defences.