Document 4 is a map of babarian invasions across medieval europe.) why were the vikings magyar and muslim invasions perceived as threatening to europe? ) document 5 is an excerpt of a poem in praise of combat from bertran de born a french nobleman and well i like a noble lord when boldly the attack he leads for he whenever he wields his sword inspures his men by his brave deeds their hearts with courage filling when tides of battles at the flood each soldier then in fighting mood to follow should be willing for no man is accounted good till blows he given and withstood.) write down what were de born's observations of warrior.