'Turtle' was an Allied contingency plan, schemed as an alternative to 'Crawdad', for Major General Lucian K. Truscott’s US VI Corps to break out of its 'Shingle' beach-head at Anzio, on the west coast of Italy, along the axis toward Carroceto, Campoleone and Rome (May 1944).

The plan was designed for implementation in the event that Generaloberst Eberhard von Mackensen’s 14^th Army of Generalfeldmarschall Albert Kesselring’s Heeresgruppe 'C' fell back more rapidly than expected after the advance of Lieutenant General Mark W. Clark’s US 5^th Army from the line of the Rapido and Garigliano rivers toward Rome in 'Diadem'. In the event the VI Corps broke out in 'Buffalo'.