ALBANY, N.Y. —  New York and Massachusetts are launching an effort to conserve dozens of roadside monuments marking the route taken by patriots who transported the artillery that forced the British from Boston during the Revolutionary War.

The granite slabs with bronze plaques serve as markers for the Knox Trail, considered one of the earliest heritage trails created in the United States.

The trail mostly follows the original route used by Gen. Henry Knox and his troops in the winter of 1775-76, when the British still occupied Boston. The Americans lugged 59 captured artillery pieces 250 miles from Fort Ticonderoga to Gen. George Washington's army at Dorchester Heights, overlooking Boston Harbor.

With their army and fleet threatened by Washington's newly arrived cannons and mortars, the British withdrew from Boston on March 17, 1776, celebrated in Boston as Evacuation Day.

"The sheer feat of getting the stuff there is pretty spectacular," said Army Maj. Jason Palmer, who teaches a course on the American Revolution at the U.S. Military Academy.

The markers were originally unveiled in 1927 to commemorate the 150th anniversary of the American Revolution. Thirty were placed in New York and 26 in Massachusetts. Three of New York's markers are missing, but the rest and all of those in the Bay State will be restored, said Mark Castiglione of the Hudson River Valley Greenway National Heritage Area, one of the organizations involved in the project.

"We want to bring the trail back to its former glory," he said.

The project will be kicked off Saturday at a monument located on the state line separating Hillsdale, N.Y., and Alford, Mass. The event will include a fife and drum band from Fort Ticonderoga and Revolutionary War re-enactors from the Boston area.

Under the guidance of metal preservation experts with the National Parks Service, the markers' bronze plaques will be cleaned and their surfaces given a new patina to restore them to their original appearance, Castiglione said. The plaques will then be sealed with a coating of hot wax to protect them from the elements.

Getting the cannons and other artillery from the southern shore of Lake Champlain to Washington's army was one of the major engineering feats of the war, Palmer said. To oversee the mission, Washington chose Knox, a 25-year-old bookseller-turned-artillery officer who fought at the Battle of Bunker Hill in 1775.

"Everything he learned was self-taught because there were no engineering schools in America," Palmer said.

It took nearly two months for Knox's troops, using ox-drawn sleds and human muscle power, to haul some 60 tons of artillery through two snow-covered mountain ranges, over the frozen Hudson River and across many other rivers and streams. On Jan. 24, 1776, the "noble train of artillery," as Knox dubbed it in a letter to Washington, arrived in Cambridge, Mass. By early March, the first battery was in position.

"To the British in Boston, it's like they appeared out of thin air because nobody thought it could be done," Palmer said.

Two weeks later, on St. Patrick's Day, the redcoats sailed away and Washington's army marched into Boston the next day.

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