Undertaking Felix, the plan to capture Gibraltar and so exclude Britain from the Mediterranean Sea, continued to occupy Hitler's mind in the last months of 1940, in spite of Franco's greed and obstinacy. Plans were drawn up, amplifying Directive No. 18, on 27th November, 1940, and there is an undated draft of a further Directive, headed Directive No. 19: Undertaking Felix, which gives detailed instructions for the operation. According to this directive, the entry of German troops into Spain would take place on 10th January, 1941, and the attack on Gibraltar about 4th February. After Gibraltar had been seized, Spanish Morocco would be occupied in order to close the Straits, and an invasion of Portugal was envisaged. Commanders In Chief were to report their plans to Hitler on 16th December. However, on 10th December Keitel issued a brief Order stating that Operation Felix, as defined in Directive No. 18, would not now be carried out as the necessary political situation no longer exists. All measures planned were to be abandoned and preparations already begun to be halted. The draft of Directive No. 19 was buried, and a new Directive, bearing that number, replaced it. The change in the political situation was caused by the obstinate refusal of Franco to accept the German invasion; the new Directive No. 19 was occasioned by the deterioration of German relations with the government of Marshal Pétain in France.