Thus writs of trespass on the case began to make their appearance; that is, writs stating a ground of complaint [275] to a trespass, but not quite amounting to a trespass as it had been sued for in the older precedents. To take an instance which is substantially one of the earliest cases, suppose that a man left a horse with a blacksmith to be shod, and he negligently drove a nail into the horse's foot. It might be that the owner of the horse could not have one of the old writs, because the horse was not in his possession when the damage was done. A strict trespass property could only be committed against the person in possession of it. It could not be committed by one who was in possession himself. /1/ But as laming the horse was equally a wrong, whether the owner held the horse by the bridle or left it with the smith, and as the wrong was closely analogous to a trespass, although not one, the law gave the owner a writ of trespass on the case. /2/ An example like this raises no difficulty; it is as much an action of tort for a wrong as trespass itself. No contract was stated, and none was necessary on principle. But this does not belong to the class of cases to be considered, for the problem before us is to trace the origin of assumpsit, which is an action of contract. Assumpsit, however, began as an action of trespass on the case, and the thing to be discovered is how trespass on the case ever became available for a mere breach of agreement. It will be well to examine some of the earliest cases in which an undertaking (assumpsit) was alleged. The first reported in the books is of the reign of Edward III. /3/ The plaintiff alleged that the defendant undertook to carry the plaintiff's horse safely across the Humber, but surcharged [276] the boat, by reason of which the horse perished. It was objected that the action should have been either covenant for breach of the agreement, or else trespass. But it was answered that the defendant committed a wrongful act when he surcharged the boat, and the objection was overruled. This case again, although an undertaking was stated, hardly introduced a new principle. The force did not proceed directly from the defendant, to be sure, but it was brought to bear by the combination of his overloading and then pushing into the stream.