On May 9, at a face-to-face meeting in El Paso, Texas, Carranza's Secretary of War and Navy, General Álvaro Obregón, threatened to send a massive force against the expedition's supply lines and forcibly drive it out of Mexico.
Funston reacted by ordering Pershing to withdraw all his troops from San Antonio de Los Arenales to Colonia Dublán.
Although the order was rescinded on the evening of May 11 when no evidence of Carrancista troop movements was found, the southernmost supply depots had been closed and materiel sent north that could not easily be turned around.
Pershing was ordered to halt in place at Namiquipa, making tactical dispositions of his forces there and on El Valle to the north.
The movements began a gradual withdrawal of the expedition to Dublán.
On May 19 units of the 10th and 11th Cavalry returned to the base to guard the supply lines with Columbus and conduct reconnaissance in the absence of the temporarily grounded 1st Aero Squadron.
As the threat of war with the de facto government increased, the northward movement continued.
Pershing's headquarters left Namiquipa on June 21, setting up again in Dublán, after which the advanced supply depot at Namiquipa closed June 23.
June 29 found the expedition concentrated on the main base and a forward camp at El Valle 60 miles to the south.

The last and most costly engagement of the Mexican Expedition was fought on June 21 when 3 officers and 87 men of Troops C and K of the 10th Cavalry, sent separately to scout Carrancista dispositions reported along the Mexican Central Railway, combined into a single column and encountered a blocking force of 300 soldiers.
They were soundly defeated at the Battle of Carrizal, with Captain Charles T. Boyd, 1st Lt.
Henry R. Adair, and ten enlisted men killed, ten wounded and another 24 (23 soldiers and 1 civilian guide) taken prisoner.
The remainder, including the sole surviving officer, Capt.
Lewis S. Morey, were rescued four days later by a relief squadron of the 11th Cavalry.
The Mexicans did not do much better; they reported the loss of 24 men killed and 43 wounded, including their commander, General Félix Uresti Gómez, while Pershing listed 42 Carrancistas killed and 51 wounded.
When General Pershing learned of the battle he was furious and asked for permission to attack the Carrancista garrison of Chihuahua City.
President Wilson refused, knowing that it would certainly start a war.

The action at Parral in April had made the destruction of Villa and his troops secondary to the objective of preventing further attacks on U.S. forces by Carrancistas.
The battle at Carrizal brought the countries to the brink of war and forced both governments to make immediate overt gestures clearly showing their intent to avoid it.
Although the United States deployed 100,000 troops on the border, by July 4 the major crisis had passed.
The Punitive Expedition, U.S. Army remained at Colonia Dublán indefinitely as a fixed-base operation to be a negative incentive to the Carranza government to take seriously its obligation to catch Villa.
The Carranza government proved unequal to the task but nevertheless U.S. operations inside Mexico virtually ceased over the next six months.

A Joint High Commission for negotiations with the Carranza government was agreed upon in July, and the first of 52 sessions met on September 6 in New London, Connecticut.
Although the commission reached accord on all issues, the negotiations failed to result in a formal agreement for withdrawal of U.S. forces signed by the Mexican government.
Despite this, Pershing was ordered on January 18, 1917 to prepare the expedition for return to the United States, which was executed between January 28 and February 5.
While the expedition made a dozen successful contacts with Villista groups in the first two months of the campaign, killing many of his important subordinates and 169 of his men, all of whom had participated in the attack on Columbus, it failed in its other major objective of capturing Villa.
However, between the date of the American withdrawal and Villa's retirement in
On May 9, at a face-to-face meeting in El Paso, Texas, Carranza's Secretary of War and Navy, General Álvaro Obregón, threatened to send a massive force against the expedition's supply lines and forcibly drive it out of Mexico. Funston reacted by ordering Pershing to withdraw all his troops from San Antonio de Los Arenales to Colonia Dublán. Although the order was rescinded on the evening of May 11 when no evidence of Carrancista troop movements was found, the southernmost supply depots had been closed and materiel sent north that could not easily be turned around. Pershing was ordered to halt in place at Namiquipa, making tactical dispositions of his forces there and on El Valle to the north. The movements began a gradual withdrawal of the expedition to Dublán. On May 19 units of the 10th and 11th Cavalry returned to the base to guard the supply lines with Columbus and conduct reconnaissance in the absence of the temporarily grounded 1st Aero Squadron. As the threat of war with the de facto government increased, the northward movement continued. Pershing's headquarters left Namiquipa on June 21, setting up again in Dublán, after which the advanced supply depot at Namiquipa closed June 23. June 29 found the expedition concentrated on the main base and a forward camp at El Valle 60 miles to the south.
The last and most costly engagement of the Mexican Expedition was fought on June 21 when 3 officers and 87 men of Troops C and K of the 10th Cavalry, sent separately to scout Carrancista dispositions reported along the Mexican Central Railway, combined into a single column and encountered a blocking force of 300 soldiers. They were soundly defeated at the Battle of Carrizal, with Captain Charles T. Boyd, 1st Lt. Henry R. Adair, and ten enlisted men killed, ten wounded and another 24 (23 soldiers and 1 civilian guide) taken prisoner. The remainder, including the sole surviving officer, Capt. Lewis S. Morey, were rescued four days later by a relief squadron of the 11th Cavalry. The Mexicans did not do much better; they reported the loss of 24 men killed and 43 wounded, including their commander, General Félix Uresti Gómez, while Pershing listed 42 Carrancistas killed and 51 wounded. When General Pershing learned of the battle he was furious and asked for permission to attack the Carrancista garrison of Chihuahua City. President Wilson refused, knowing that it would certainly start a war.
The action at Parral in April had made the destruction of Villa and his troops secondary to the objective of preventing further attacks on U.S. forces by Carrancistas. The battle at Carrizal brought the countries to the brink of war and forced both governments to make immediate overt gestures clearly showing their intent to avoid it. Although the United States deployed 100,000 troops on the border, by July 4 the major crisis had passed. The Punitive Expedition, U.S. Army remained at Colonia Dublán indefinitely as a fixed-base operation to be a negative incentive to the Carranza government to take seriously its obligation to catch Villa. The Carranza government proved unequal to the task but nevertheless U.S. operations inside Mexico virtually ceased over the next six months.
A Joint High Commission for negotiations with the Carranza government was agreed upon in July, and the first of 52 sessions met on September 6 in New London, Connecticut. Although the commission reached accord on all issues, the negotiations failed to result in a formal agreement for withdrawal of U.S. forces signed by the Mexican government. Despite this, Pershing was ordered on January 18, 1917 to prepare the expedition for return to the United States, which was executed between January 28 and February 5. While the expedition made a dozen successful contacts with Villista groups in the first two months of the campaign, killing many of his important subordinates and 169 of his men, all of whom had participated in the attack on Columbus, it failed in its other major objective of capturing Villa. However, between the date of the American withdrawal and Villa's retirement in 
Pancho Villa Expedition