Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: A short spear ('anazah) was planted in front of the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) prayed towards it, while mounts were passing behind it.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11570