What army tried to attack St Clare and the Poor Clare's?

There are several saints named St. Clare but only one saint named Clare of Assisi.

St Clare was a woman of devotion care love faith..St. Clare of Assisi (16 July, 1194 - 11 August, 1253) co-founded the Catholic Church's Order of Poor Ladies, also known as Clares. She was the first...

Yes

Nope, she died in her own bed an old woman.

from The Divine Office for August 11:Saint Clare was born at Assisi in 1193. She followed her fellow citizen, Saint Francis, i a life of poverty and became mother and foundress of an order of nuns....