Following the Normandy landings, a captured German officer was allowed to watch war materiel coming onto Omaha Beach.
He asked his minder, “Where are all the horses?”
Another answer on that Quora pages states,
I have read literally hundreds of German prisoner accounts of their encounter with Americans. A stunningly high percentage of these intelligence interrogations mention a single factor that seems to have overwhelmingly struck the Germans —- the Americans brought NO horses or mules. The lack of pack animals and horse-drawn wagons was significant enough that most German prisoners mentioned it as a factor in their decision to surrender.
In fact, Rommel had spent an inordinate amount of effort and money in strengthening the Atlantic Wall to see to it that American horses and mules would not be able to find forage and that all fodder was well behind the Wall, but close enough to feed the thousands of mules and horses upon which the Nazi war machine relied. The Nazis spent a larger portion of their military budget on horses than tanks!
German soldiers immediately realized that the Allies brought no horses! That meant that the Allies could produce jeeps and gasoline faster and cheaper than Germans could produce horses and hay. For a common infantryman, this was apparently a huge and woeful epiphany that is almost never mentioned. On the other hand, I never saw the lack of Allied horses and mules even mentioned once in higher level reports of the day. - https://www.quora.com/What-offended-the-German-military-when-the-American-military-came-to-Germany/answer/R-W-Carmichael