"During the year of the conquest, when the Prophet ﷺ reached Marr Zahran, he told us that we would meet the enemy. So he ordered us to break the fast, and we [all] broke our fast."  

لَمَّا بَلَغَ النَّبِيُّ ﷺ عَامَ الْفَتْحِ مَرَّ الظَّهْرَانِ فَآذَنَنَا بِلِقَاءِ الْعَدُوِّ فَأَمَرَنَا بِالْفِطْرِ فَأَفْطَرْنَا أَجْمَعُونَ