Hundreds of protesters are due to start marching from Lincoln to RAF Waddington against the use of armed drone aircraft.
It's the first time the Ministry of Defence has based the spy planes in the UK, which will be deployed over Afghanistan.
Today's march will start at South Park, down the A15 Cross O'Cliff hill and down Grantham Road to a Peace camp set up outside the airbase.
More top news
Feeling cool with sunshine and showers
Feeling cool this afternoon with sunshine and showers.
A teenager from Coventry will temporarily become the youngest soldier in the British Army when he signs up on his 18th birthday.