On 12 May 1700 Otto Vellingk wrote to Charles XII, stating that he was on his way to join the relief corps. Major General Maydell, who was in charge of the lead units, had attacked the Saxons and made them go back across the Düna. Vellingk was very pleased with this development and assured the King that rumours about strong Saxon reinforcements most likely were untrue. As the Polish Republic apparently did not want to have anything to do with the war it was likely that Augustus could find no other support than Oginski's forces. No matter what the Saxons brought, Vellingk stated, he would put up such a resistance that they could not cross the Düna again even if they managed to gather a force three times as strong as Vellingk's. He would even, Vellingk assured Charles XII, seek out those places where the glorious Gustav II Adolf had crossed the river and make an attack on the enemy (these proud boasts are quite similar to the ones made by Major General Cronhjort in Ingria when he took charge after the battle of Narva. The results there were also quite similar to the ones Vellingk managed to produce....)
Vellingk reached his army on 17 May. On the 21st he wrote the King again. All was well and the enemy back on the south side of the river. The fear among them was great. The duchess of Courland and many citizens of Mitau had already brought their possessions to safety, while some nobles had requested letters of protection from Vellingk. The general has assured everyone that no harm would come to them who respected the Treaty of Oliva. Three bridges were being built in order to make an attack across the river possible and Vellingk stated that he would soon make the Saxons regret their attack on Riga. In Vellingk's opinion the Saxons enterprise was a speculation, attempted in the hope of receiving support from Hetman Sapieha, Brandenburg and the Czar. But these hopes were all in vain. According to rumour Lt. General Flemming had been arrested in Warsaw and Patkul had gone into hiding. Prince Ferdinand of Courland had tried to raise three regiments, but the nobility had refused. The recruitment attempts by the Saxons had completely failed. Colonel Göhr had promised to recruit 400 but had arrived in camp with just 40. Everything was going fantastic!
A couple of weeks the mood was a bit different. On 4 June Vellingk wrote that he needed more supplies before he could cross as the Saxons already had taken everything on the other side. It would also send bad signals if Vellingk went into Courland and had his army live off the land when the Polish Republic remained neutral.
Source: Riksarkivet, Skrivelser till Konungen. Karl XII, vol. 29