Claim: During the sixth round of the 1944–45 Copa Federación de España (a Spanish football competition for teams who have failed to qualify in the first round of the Copa del Rey), the San Martin team won over Eldense with an aggregate score of 8-5, with Valladolid in second place against Santiago with an aggregate score of 3-4.
Evidence: The Copa Federación de España 1944–45 was the 1st staging (old competition) of the Copa Federación de España, a knockout competition for Spanish football clubs. Eldense 5–8 San Martín 1–3 4–5 Santiago 3–4 Valladolid 2–0 1–4 The competition began on 18 February 1945 and ended with the final on 21 May 1945, where San Martín became champion after defeating Valladolid. 
The Campeonato de España–Copa de Su Majestad el Rey, commonly known as Copa del Rey or simply La Copa and formerly known as Copa del Generalísimo (1939–76), is an annual knockout football competition in Spanish football, organized by the Royal Spanish Football Federation.