History time again, people.
In 1969, when Harold Wilson was Prime Minister and James Callaghan was Home Secretary troops were sent into into Northern Ireland in what the government called a "limited operation" to restore law and order.
This followed three days and two nights of violence in the Bogside area of Derry. Trouble had erupted in Belfast and other towns across Northern Ireland.
The decision also followed a speech by the Taoiseach, Jack Lynch, in which he called for a United Nations peacekeeping force to be sent to the province.
He also called for Anglo-Irish talks on the future of Northern Ireland.
Some - and you can imagine who they were - called this "outrageous interference".
Meanwhile The Prime Minister of Northern Ireland, Major James Chichester-Clark - a fine old Irish name - responded by saying neighbourly relations with the Republic were at an end and that British troops were being called in.
300 troops from the 1st Battalion, Prince of Wales's Own Regiment of Yorkshire, who had been on standby at sea for a couple of days occupied the centre of Derry, replacing the police officers who had been patrolling the cordons around the Bogside.
And yes, the arrival of the British troops was greeted with cheering and singing from behind the barricades in the Catholic area of Derry. They were chanting: "We've won, we've won. We've brought down the government."
I remember watching the scenes on television as the housewives brought cups of tea out to the soldiers.
Sadly the army's warm welcome was short-lived, as was the British Government's intention to pull out the troops within days.