"And if you fear, then [pray] on foot or riding." The interpretation of Qatada, who said: This is [applicable] during the heat of battle.
﴿فَإِنْ خِفْتُمْ فَرِجَالا أَوْ رُكْبَانًا﴾ تَفْسِير قَتَادَة قَالَ: هَذَا عِنْد الضراب