Up to 35,000 crosses each with a personal message from members of the public will be planted within the grounds of Lydiard House
The first remembrance field dedicated to those killed in Afghanistan is to be opened in Swindon by Prince Harry.
Up to 35,000 crosses, each with a dedicated message, will be planted within the grounds of Lydiard House.
The Royal British Legion Wootton Bassett Field of Remembrance will be officially opened on Tuesday.
Prince Harry, who has served in Afghanistan will plant a Remembrance Cross in the Field and take part in a two minute silence ceremony.
The Service of Remembrance and the Field of Remembrance are to honour the 342 men and women killed in Afghanistan since the conflict began in 2001.
Anne Bevis, the Royal British Legion repatriation officer said: "It will mean a lot to the people of Wootton Bassett and Wiltshire to know that there is a field of remembrance solely dedicated to those men and women in the British armed forces who have lost their lives in Afghanistan.
Prince Harry will plant a Remembrance Cross in the Wootton Bassett field of remembrance
"This is the first of its kind, and we're very proud."
The Prince will also meet teams from the Army, Navy, RAF and Royal Marines hoping to raise £1m for the Royal British Legion in the 1,000 mile march for honour.
Major Richard Arden, based at Lucknow Barracks in Tidworth, is one of the service personnel taking part in the gruelling challenge.
He said: "Prince Harry will be there to take part in the Service of Remembrance and will also be there to meet the March for Honour teams and send them on their way, when they leave Wootton Bassett for the Royal Albert Hall in London.
"He's a great ambassador for the armed forces and it's great to have that level of support.
"It just shows how much the country will really get behind this campaign."
The Wootton Bassett field of remembrance at Lydiard Park's Walled Garden will be open daily from 9am to 4pm from Tuesday, November 9 until Sunday, 21 November.