The young infantry lieutenant was just another officer in the line in 1846 when U.S. forces entered battle against a superior Mexican force at Palo Alto, "Tall Trees," ending up at the front as an artillery duel tipped the balance of power.
It was the first major battle of the U.S.-Mexican War. President James K. Polk's attempts to annex Texas and buy the lands west of the amiable state had failed, and the Army was sent in under Gen. Zachary Taylor to force the issue, starting at the Battle of Palo Alto where a young West Point graduate would first face the guns of the enemy.
Then-Lt. Ulysses S. Grant, at left. Grant and Lt. Alexander Hays fought together in Mexico and later in the Civil War where Hays was killed.
(Public domain, retrieved from University of Texas Arlington)
Cadet Ulysses S. Grant had been an underwhelming student, graduating 21st in a class of 39 students in 1843. But even the lowest West Point graduate commissions as a lieutenant, and Grant was sent to be the quartermaster in the 4th Infantry despite having proven himself as an adept horseman.
The young lieutenant was in the line of battle on May 8, 1846, when U.S. federal troops baited Mexican troops into attacking and beginning hostilities. He would complain late in life that he thought the war was unjust and that Polk was wrong to have provoked it, but in 1846 he was just a lieutenant ordered to fight with his men.
Palo Alto was named for the tall trees in the area, and Mexican artillery and cavalry numbering almost 4,000 men and 12 artillery pieces had positioned themselves on a hilltop near these trees. The U.S. forces arrayed against them had almost 2,300 troops and only 8 artillery pieces, and they had to march through tall grass and up the slope to attack.
An illustration shows U.S. troops engaging Mexican soldiers at the Battle of Palo Alto.
(Adolphe Jean-Baptiste Bayot)
The reluctant lieutenant noted the enemy's arms and superior numbers in his memoirs, saying:
As I looked down that long line of about three thousand armed men, advancing towards a larger force also armed, I thought what a fearful responsibility General Taylor must feel, commanding such a host and so far away from friends.
But Grant's memoirs also provide a window of hope for the U.S. forces. Though outnumbered, they had a clear technological advantage:
an army, certainly outnumbering our little force, was seen, drawn up in line of battle just in front of the timber. Their bayonets and spearheads glistened in the sunlight formidably. The force was composed largely of cavalry armed with lances. Where we were the grass was tall, reaching nearly to the shoulders of the men, very stiff, and each stock was pointed at the top, and hard and almost as sharp as a darning-needle.
So the men were in tall, sharp grass like they were advancing through a sea of rapiers, but their enemy was relying on lances to pierce through the infantry. Lances were a dangerous weapon at the time, but disciplined infantry could still give better than they got under lance attack if they stayed in formation and fired when the horsemen were close.
But if they broke and ran, lancers would slice through the lines and gut one man after another.
As Grant and the men advanced, the Mexican artillery was the first to fire, but they opened fire when the U.S. lines were still too far away, and the grass proved itself to be quite useful to the Yanks.
As we got nearer, the cannon balls commenced going through the ranks. They hurt no one, however, during this advance, because they would strike the ground long before they reached our line, and ricocheted through the tall grass so slowly that the men would see them and open ranks and let them pass. When we got to a point where the artillery could be used with effect, a halt was called, and the battle opened on both sides.
Major Ringgold, an artillery officer, was killed at the Battle of Palo Alto.
It was at this point that the U.S. artillery advantage showed itself. The infantry on either side could still inflict little damage as they were too far apart for accurate musket fire. But while the U.S. soldiers were barely in the effective range of Mexican artillery, American artillery could reach further and with greater effect.
The artillery was advanced a rod or two in front of the line, and opened fire. The infantry stood at order arms as spectators, watching the effect of our shots upon the enemy, and watching his shots so as to step out of their way. It could be seen that the eighteen-pounders and the howitzers did a great deal of execution. On our side there was little or no loss while we occupied this position.
For most of the day, Grant and the infantry would trade limited shots with the enemy infantry while their artillery punished the Mexican forces. The U.S. did suffer losses; Grant makes note of two artillery officers hit nearby, one of them killed. The Mexican cavalry tried to turn the U.S. flank, but disciplined infantry fire drove them back. The limited U.S. infantry advances and the punishing artillery fire made good effect, and the Mexican forces began to withdraw before sunset.
Grant went forward under fire to occupy the vacated positions and saw the effects of Mexican artillery at close range.
In this last move there was a brisk fire upon our troops, and some execution was done. One cannon-ball passed through our ranks, not far from me. It took off the head of an enlisted man, and the under jaw of Captain Page of my regiment, while the splinters from the musket of the killed soldier, and his brains and bones, knocked down two or three others, including one officer, Lieutenant Wallen,—hurting them more or less. Our casualties for the day were nine killed and forty-seven wounded.
When Grant and the U.S. forces advanced the next day, they found that their enemy had departed. The Battle of Palo Alto was over with a decisive U.S. victory. But there was a lot of war left to fight, and Grant was at or near the front for most of the major battles, serving under Gen. Taylor for the start but transferring to Gen. Winfield Scott's command in 1847 before the battles of Vera Cruz, Cerro Gordo, Churubusco, Molino del Rey, and Chapultepec.
During these engagements, he was twice promoted by brevet for bravery, reaching the rank of brevet captain.