In times of difficulty the angels come to assist them. In that battle the Muslims were only 313 and the enemy was thousands. Allah (swt) sent 3,000 angels to help them. Allah gave them even better news that an extra 2,000 angels will come to help if you have these two characteristics. Having patience and being conscious of Allah will gain you this help.
Throughout our lives our own enemies, those who do not like us for the right or wrong reasons will come but if we develop tawqa and have patience the help of Allah is with us!