On 11 January 1706, Marlborough finally reached London at the end of his diplomatic tour but he had already been planning his strategy for the coming season. The first option (although it is debatable to what extent the Duke was committed to such an enterprise) was a plan to transfer his forces from the Spanish Netherlands to northern Italy; once there, he intended linking up with Prince Eugene in order to defeat the French and safeguard Savoy from being overrun. Savoy would then serve as a gateway into France by way of the mountain passes or an invasion with naval support along the Mediterranean coast via Nice and Toulon, in connexion with redoubled Allied efforts in Spain. It seems that the Duke's favoured scheme was to return to the Moselle valley (where Marshal Marsin had recently taken command of French forces) and once more attempt an advance into the heart of France. But these decisions soon became academic. Shortly after Marlborough landed in the Dutch Republic on 14 April, news arrived of big Allied setbacks in the wider war. Determined to show the Grand Alliance that France was still resolute, Louis XIV prepared to launch a double surprise in Alsace and northern Italy. On the latter front Marshal Vendôme defeated the Imperial army at Calcinato on 19 April, pushing the Imperialists back in confusion (French forces were now in a position to prepare for the long-anticipated siege of Turin). In Alsace, Marshal Villars took Baden by surprise and captured Haguenau, driving him back across the Rhine in some disorder, thus creating a threat on Landau. With these reverses, the Dutch refused to contemplate Marlborough's ambitious march to Italy or any plan that denuded their borders of the Duke and their army. In the interest of coalition harmony, Marlborough prepared to campaign in the Low Countries. The Duke left The Hague on 9 May. "God knows I go with a heavy heart," he wrote six days later to his friend and political ally in England, Lord Godolphin, "for I have no hope of doing anything considerable, unless the French do what I am very confident they will not … " – in other words, court battle. On 17 May the Duke concentrated his Dutch and English troops at Tongeren, near Maastricht. The Hanoverians, Hessians and Danes, despite earlier undertakings, found, or invented, pressing reasons for withholding their support. Marlborough wrote an appeal to the Duke of Württemberg, the commander of the Danish contingent – "I send you this express to request your Highness to bring forward by a double march your cavalry so as to join us at the earliest moment …"