desire to show him the Secret Treaty of Dover with France, directed at destroying the Dutch Republic and installing William as "sovereign" of a Dutch rump state. In addition to differing political outlooks, William found that his lifestyle differed from his uncles, Charles and James, who were more concerned with drinking, gambling, and cavorting with mistresses. The following year, the Republic's security deteriorated quickly as an Anglo-French attack became imminent. In view of the threat, the States of Gelderland wanted William to be appointed Captain-General of the Dutch States Army as soon as possible, despite his youth and inexperience. On 15 December 1671, the States of Utrecht made this their official policy. On 19 January 1672, the States of Holland made a counterproposal: to appoint William for just a single campaign. The prince refused this and on 25 February a compromise was reached: an appointment by the States General for one summer, followed by a permanent appointment on his 22nd birthday. Meanwhile, William had written a secret letter to Charles in January 1672 asking his uncle to exploit the situation by exerting pressure on the States to appoint William stadtholder. In return, William would ally the Republic with England and serve Charles's interests as much as his "honour and the loyalty due to this state" allowed. Charles took no action on the proposal, and continued his war plans with his French ally. Becoming stadtholder "Disaster year": 1672 For the Dutch Republic, 1672 proved calamitous. It became known as the Rampjaar ("disaster year") because in the Franco-Dutch War and the Third Anglo-Dutch War, the Netherlands was invaded by France and its allies: England, Münster, and Cologne. Although the Anglo-French fleet was disabled by the Battle of Solebay, in June the French army quickly overran the provinces of Gelderland and Utrecht. On 14 June, William withdrew with the remnants of his field army into Holland, where the States had ordered the flooding of the Dutch Water Line on 8 June. Louis XIV of France, believing the war was over, began negotiations to extract as large a sum of money from the Dutch as possible. The presence of a large French army in the heart of the Republic caused a general panic, and the people turned against De Witt and his allies. On 4 July, the States of Holland appointed William stadtholder, and he took the oath five days later. The next day,