Sony mistakenly included PSP game Legends of War Paton’s Campaign as a free title for PlayStation Plus subscribers. In an official tweet from Sony’s EU account, the error has been explained along with an announcement that History: Legends of War will take its place as a January game for members of the service.
Heads-up PS Plus members – Legends of War: Patton’s Campaign (PSP) was mistakenly included in January’s Monthly Games.
— PlayStation Europe (@PlayStationEU) January 7, 2016
Source: PlayStation Europe (via IGN)