Probably he saw he had blundered. On April 26 he knew that war had begun, and called upon Louisiana and Texas for soldiers with a view to the invasion of Mexico, which he must have believed, under the circumstances, that his government wished. By the rules of the service it was then his duty, as he well knew, to make requisitions for everything the campaign would require,[10.12] and a zealous commander, gathering--as Taylor had been instructed to do--all the information he could find regarding the local conditions, might reasonably have sent on to Washington with it an able officer to assist the department. With a scorn, however, for science and vision that should have delighted Polk, Taylor did neither; but, assuming that the Mexicans would not fight--if at all--north of the mountains beyond Monterey, he determined to advance with about 6000 men. Unfortunately he neglected to have his engineers inspect the three steamboats on which his plan depended, and these proved to be worm-eaten and practically useless.[10.13] [TROOPS ADVANCE] About the middle of June, boats for the Rio Grande began to be despatched from New Orleans, but--in addition to mishaps at the coast resulting from gales and the freaks of the shifting bars--a serious embarrassment soon occurred above. A direct advance against Monterey by land was deemed impracticable, because the route lacked water. Taylor had therefore planned to have his troops march to Camargo, the head of navigation toward that city, and send their supplies to that point by the river; but during the first eleven days of July rain fell heavily and flooded the country. The freshet, however, ensured a sufficient depth in the Rio Grande, and on July 6 the Seventh Infantry set out for Camargo. The distance, called about 120 miles by land, was more than twice as long by water; and the river wandered about so much that according to humorous natives a bird could never get across--always alighting on some projection of the bank from which it had risen. It proved a hard task for the light and feeble steamboats, with only green wood for the boilers, to stem the fierce current; the pilots were unacquainted with the difficulties of such navigation;[10.14] and in making one of the sharp turns a boat was frequently caught by the current, and swept downstream or against the bank--breaking the rudder perhaps.[10.16]