To invoke Allah to defeat and shake Al-Mushrikun
حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، أَخْبَرَنَا عِيسَى، حَدَّثَنَا هِشَامٌ، عَنْ مُحَمَّدٍ، عَنْ عَبِيدَةَ، عَنْ عَلِيٍّ ـ رضى الله عنه ـ قَالَ لَمَّا كَانَ يَوْمُ الأَحْزَابِ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَلأَ اللَّهُ بُيُوتَهُمْ وَقُبُورَهُمْ نَارًا، شَغَلُونَا عَنِ الصَّلاَةِ الْوُسْطَى حِينَ غَابَتِ الشَّمْسُ ".
Narrated `Ali: When it was the day of the battle of Al-Ahzab (i.e. the clans), Allah's Messenger (ﷺ) said, "O Allah! Fill their (i.e. the infidels') houses and graves with fire as they busied us so much that we did not perform the prayer (i.e. `Asr) till the sun set."