The British Admiralty proposed four plans in response to attacks on British shipping, favouring sending significant naval resources to the Mediterranean as the best solution; previous control measures had been widely evaded.
O almirantado británico propuxo catro plans en resposta ós ataques a transportes británicos, favorecendo o envío de recursos significativos ó Mediterráneo como a mellor solución, xa que as medidas de control establecidas previamente non deran bos resultados.