They don't. They needn't worry about it.
I assume you mean "Viking," not "vinking," and "people," not "people" (spelling and grammar count when posting for the whole world to read and figure out what you mean).
The Vikings haven't been a threat for more than 1,000 years. Thus, there are no raids.
In my opinion as a woman: Puma shoes feel more stylish and versatile, while Viking shoes are sturdier for outdoors, choose by your needs.
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to protect people from air raids.
they don't
Air raids on Britain by Germany mainly used Zeppelin airships, although in 1917, aeroplanes were used. Tthe raids generated fear amongst the civilian population and consumed more resources than the actual raids - more than 10,000 men were diverted to air defenses. Altogether 557 people were killed in air raids in Britain in approximately 100 raids.
to arrest people who were thought to be radicals
A lot of people who run the AQ raids.
Duck and Cover.
In order to surive
They just do
Be specific.
Raids on enemy or neutral towns, sale of POWs.