US Presidency
1847

If the enemy be repulsed in one attack, he would have nothing to do but to retreat to his own side of the line, and, being in no fear of a pursuing army, may reenforce himself at leisure for another attack on the same or some other post. He may, too, cross the line between our posts, make rapid incursions into the country which we hold, murder the inhabitants, commit depredations on them, and then retreat to the interior before a sufficient force can be concentrated to pursue him. Such would probably be the harassing character of a mere defensive war on our part. If our forces when attacked, or threatened with attack, be permitted to cross the line, drive back the enemy, and conquer him, this would be again to invade the enemy's country after having lost all the advantages of the conquests we have already made by having voluntarily abandoned them.