At night `Abdullah bin `Umar used to offer the prayer on the back of his animal during the journey and never cared about the direction he faced. Ibn `Umar said, "Allah's Messenger (ﷺ) used to offer the optional prayer on the back of his Mount facing any direction and also used to pray the witr on it but never offered the compulsory prayer on it."
Reference: Sahih al-Bukhari 1098 In-book : Book 18, Hadith 18 USC-MSA web (English) : Vol. 2, Book 20, Hadith 202 (deprecated)
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