The old army is disbanded and Marines become Haiti's police

The treaty provided for five American services in Haiti: financial adviser, customs receivership, public works, public health and gendarmerie. The gendarmerie came first. The Haitian army was dissolved, and on 1 February 1916 the Gendarmerie d'Haïti took over policing the whole country with 1,500 men. French speaking American officers held the senior posts, while Marine sergeants and navy hospital corpsmen were made junior officers. The first commandant was Smedley Butler, whom Dartiguenave commissioned a général de division; Butler later said the rank made him chief of police. Recruits were easy to find, many of them former Cacos, because the pay arrived on time and the rations were decent. By June 1916 the force numbered 2,553 under 115 Americans. Medical examinations found malaria, yaws or syphilis in 95 percent of recruits and intestinal parasites in 85 percent. An American writing in 1919 noted that a Marine serving as a gendarmerie officer judged the civil and criminal cases of his district, paid out all national government money there, ran its schools and controlled its mayor and council.

On the morning of 26 August 1915, a month after the Marines came ashore, Caroline Dagille sent Ludowick Jeudi, aged seventeen or nineteen, out on errands. Her instructions took him toward the corner of Rue du Pont and Rue Oswald Durand in Cap-Haïtien. On that same morning a man named Louie Joseph was being held at the American regional headquarters in the railway station on Rue du Pont, accused of stealing a cow. When the woman who had accused him arrived to make her statement, Joseph saw her and ran. Corporal Fred Parsons drew his pistol and fired twice down a busy street. People scattered after the first shot, apart from a few children crouching at the west end of the bridge. Joseph stopped and gave himself up. Ludowick had just turned the corner. He was hit, ran along Rue Oswald Durand and dropped. Dagille found him sitting in a chair against a wall some two hundred yards off, his body cooling to the temperature of the stone behind him. His parents lived in the country and had trusted her with him.

Davilmar Theodore, short of money and short of allies, could not refuse Vilbrun Guillaume the post of military delegate for the north and northwest. Cap Haitien was full of unpaid Cacos drifting back from the capital and attaching themselves to the Zamorist faction, now led by Bussy Zamor and by Charlemagne Peralte, Charles Zamor's brother in law. On 15 January 1915 Guillaume called the leading citizens of the Cap together, announced that he was a candidate for the presidency, and told them a Caco army was approaching and the government had given him nothing to stop it with. The morning paper reported that the Capois had unanimously entrusted their fate to him. The Caco general Metellus appeared the same day at Barriere-Bouteille with a thousand men and several cannon. He paraded them in front of the cathedral, went inside, marched around the town and looted nothing. On the nineteenth his guns fired a seventeen gun salute, and Guillaume declared himself head of the executive power.

The armoured cruiser Washington was off Cape Hatteras when a signal reached her flag officer: proceed to Cap Haitien without delay. She anchored outside the harbour on 23 January 1915 with Rear Admiral William B. Caperton aboard. The American consul Livingston had cabled for a warship the day Vilbrun Guillaume announced he wanted the presidency. On 27 January Livingston reported to Washington that not one shot had been fired in the town or anywhere near it, that Metellus had brought a thousand men in on the sixteenth and stayed to escort Guillaume south, and that the whole business had the look of a public holiday. Caperton's chief of staff, Captain E. L. Beach, had last seen the Cap in 1891. He found business at a standstill, cobblestones the French had laid a hundred and fifty years earlier still unrepaired, walls cracked and crumbling, and one activity in good health, which was revolution. Caperton called on Guillaume on the twenty fifth and recognised the general as the servant who had shown him in.