British troops have ended combat operations in Afghanistan as they and US troops handed over two huge adjacent bases to the Afghan military, 13 years after a US-led invasion to topple the Taliban.

The troops handed over to Afghan forces on Sunday at camps Bastion and Leatherneck, in the southwestern province of Helmand. The timing of their withdrawal had not been announced for security reasons.

Their departure on Sunday leaves Afghanistan and its newly installed president, Ashraf Ghani, to deal almost unaided with an emboldened Taliban after the last foreign combat troops withdraw by year-end.

Live Box 201491152731407786

Leatherneck and Bastion formed the international coalition's regional headquarters for the southwest of Afghanistan, housing up to 40,000 military personnel and civilian contractors.

After Sunday's withdrawal, the Afghan National Army's 215th Corps will be headquartered at the 28sq km base, leaving almost no foreign military presence in Helmand.

The US military leaves behind about $230m of property and equipment for the Afghan military.

This includes a major airstrip at the base, plus roads and buildings.

Camp Leatherneck resembled on Sunday a dust-swept ghost town of concrete blast walls, empty barracks and razor wire.

Offices and bulletin boards, which once showed photograph tributes to dead US and British soldiers, had been stripped.

Heaviest fighting

The British experienced their heaviest fighting of the Afghan campaign in Helmand, losing hundreds of soldiers.

Their presence was boosted in recent years by US troops as the UK wound down its operations.

In all, 2,210 US and 453 British soldiers have been killed in Afghanistan since 2001, when the US-led coalition toppled the Taliban government shortly after the September 11 attacks.

Live Box 201239113414952721

"We gave them the maps to the place. We gave them the keys," said Colonel Doug Patterson, a US marine brigade commander in charge of logistics.

General John Campbell, the head of coalition forces in Afghanistan, acknowledged Helmand "has been a very, very tough area" over the last several months.

"But we feel very confident with the Afghan security forces as they continue to grow in their capacity," he said.

He said the smaller international force that will remain next year will still provide some intelligence and air support, two areas where Afghan forces are weak.

General Sher Mohammad Karimi, chief of staff of the Afghan army, said the Taliban "will keep us busy for a while".

"We have to do more until we are fully successful and satisfied with the situations," he said.

Source: AP