From A Wiki of Ice and Fire
Grindcorn Mill is a mill in the Riverlands. It is disputed land between House Bracken and House Blackwood. It is currently held by House Blackwood.
A Dance with Dragons
Grindcorn Mill is disputed between House Bracken and House Blackwood. Lord Jonos Bracken unsuccessfully asks Ser Jaime Lannister for Grindcorn Mill for subduing Lord Tytos Blackwood.