I saw the Prophet ﷺ offering the prayer on his mount (Rahila) whatever direction it took.  

رَأَيْتُ النَّبِيَّ ﷺ يُصَلِّي عَلَى رَاحِلَتِهِ حَيْثُ تَوَجَّهَتْ بِهِ  

Yahya related to me from Malik from Abdullah ibn Dinar from Abdullah ibn Umar that the Messenger of Allah ﷺ used to pray on his mount while travelling, whichever way it was facing. Abdullah ibn Dinar said, "Abdullah ibn Umar would also do that."  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُصَلِّي عَلَى رَاحِلَتِهِ فِي السَّفَرِ حَيْثُ تَوَجَّهَتْ بِهِ قَالَ عَبْدُ اللَّهِ بْنُ دِينَارٍ وَكَانَ عَبْدُ اللَّهِ بْنُ عُمَرَ يَفْعَلُ ذَلِكَ  

[Machine] "He saw the Messenger of Allah ﷺ praying on his mount wherever it turned."  

أَنَّهُ رَأَى رَسُولَ اللهِ ﷺ يُصَلِّي عَلَى رَاحِلَتِهِ حَيْثُ تَوَجَّهَتْ بِهِ  

[Machine] The Prophet of Allah ﷺ used to pray on his mount wherever it directed him.  

كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي عَلَى رَاحِلَتِهِ حَيْثُمَا تَوَجَّهَتْ بِهِ  

[Machine] He used to pray where his riding animal had faced, and the Messenger of Allah ﷺ used to do it.  

أَنَّهُ كَانَ يُصَلِّي حَيْثُ تَوَجَّهَتْ بِهِ رَاحِلَتُهُ قَالَ وَكَانَ رَسُولُ اللهِ ﷺ يَفْعَلُهُ  

[Machine] He heard Ibn Umar say, "The Messenger of Allah ﷺ used to pray on his mount wherever it turned in the journey."  

أَنَّهُ سَمِعَ ابْنَ عُمَرَ يَقُولُ «كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي عَلَى رَاحِلَتِهِ حَيْثُ تَوَجَّهَتْ بِهِ فِي السَّفَرِ»  

[Machine] The Prophet ﷺ used to pray wherever his mount faced.  

«كَانَ النَّبِيُّ ﷺ يُصَلِّي حَيْثُ تَوَجَّهَتْ بِهِ رَاحِلَتُهُ»  

" عَنِ ابْنِ عُمَرَ أنَّه كَانَ يُصَلِّى عَلَى رَاحِلَتِهِ تَطَوُّعًا حَيث تَوجَّهَتْ بهِ، وَيخبرُهُمْ أَنَّ رَسُولَ الله ﷺ كَانَ يَفْعَلُه ".