There was a state of fear in Medina. Messenger of Allah ﷺ rode a horse belonging to Abu Talha (in order to see the matter). The Prophet ﷺ said, "We could not see anything, and we found that horse like a sea (fast in speed).
كَانَ بِالْمَدِينَةِ فَزَعٌ فَرَكِبَ رَسُولُ اللَّهِ ﷺ فَرَسًا لأَبِي طَلْحَةَ فَقَالَ مَا رَأَيْنَا مِنْ شَىْءٍ وَإِنْ وَجَدْنَاهُ لَبَحْرًا