The phrase "take up weapons" is correct and usable in written English.
You could use it in a variety of contexts, for example: The people of the small village had no choice but to take up weapons in defense against the invading army.
You have to take up weapons".
"If there is a war the whole population will take up weapons".
If my friends fighting with the rebels are hurt, or if my home is damaged, I won't run away, I'll take up weapons and join".
"Poroshenko is forced to take up weapons and continue the war but at the same time make unclear statements about a one-sided ceasefire," Khodakovsky said.
Thundering against the incendiary anti-Muslim film trailer that recently appeared on the internet, he warned his brothers to prepare for battle, urging them to take up weapons against incoming "Crusader armies".
"Personally I am a fan of the civilised, democratic intelligent way of deciding conflicts, but if we need to take up weapons then of course I will be ready," said Yulia Bereznikova, the mixed martial arts champion.
Estimates of the number of protesters who have taken up weapons are anecdotal.
When a community takes up weapons, people fight with what they have.
When he entered national politics, it would have been folly to imagine Barr taking up weapons against his party.
She also said that members of the Free Syrian Army, a group of Syrian Army defectors and others who have taken up weapons against the government, had captured an unspecified number of Syrian soldiers in Talbiseh.
It was the first time that a high-ranking Syrian official had signaled that the government is open to talking with Syrian rebels who have taken up weapons against the armed forces.
