On 28 July 1701 Wolmar Anton v. Schlippenbach sent Charles XII a detailed account of the Army of Livonia. Total number (corporals & soldiers) was 3, 188 plus a detachment of unspecified strength in Marienburg. Slightly more than a month later Schlippenbach sent a new list, which showed that he on 31 August had at his immediate disposal just under 2,000 men (corporals & soldiers), while another 890 were stationed at various outposts. In the same letter, dated 9 September, he also reported on the Russian attack a couple of days earlier. At Kasaritsa and Rauge, Schlippenbach wrote, 10,000 Russians had attacked the Swedish positions and a much greater force had appeared at Rappin. He had, Schlippenbach continued, personally directed the defense and after a fierce struggle the Russians had been driven back with losses of at least 2,000 men, including two colonels (not counting those dead bodies the retreating Russians had brought off).
At Rappin, Schlippenbach wrote, the Russians had been more successful, but more than 1,000 killed had been found on the battlefield or in the stream nearby. Eventually the Swedish defenders succumbed and two old, more or less useless, cannons had been lost. Of the 500 Swedes not much more than 100 had returned. At Pechory and Pskov the enemy had about 30,000 men, Schlippenbach reported, so it was quite impossible for him to defend everything. Reinforcements were urgently needed.
Schlippenbach also enclosed the testimony of a Russian prisoner, who had been taken on the road to Pechory on 7 September. He was a clergyman by the name of "Ivan Fiedoroffschin Koroboff". He had worked in the town of "Lushi", but then been drafted into Col. "Ussiakou's" regiment. According to the prisoner this regiment was stationed at Pechory and had taken part in the attack at Rauge. "Koroboff" didn't know how strong the Russian force was, but it was commonly said in Russia that the army at the border consisted of 100,000 men. So how strong was the Russian force that had attacked? "Koroboff" said that he had been told that 30,000 were to attack the post at Rappin. He did not know the total strength at Rauge and Kasaritsa, but he was certain that the dragoons had been 3,000. Who had been in in charge? At Rappin Sheremetev's son and at Rauge and Kasaritsa a certain "Jacob Michititz".
In the minutes of the interrogation it was also noted that two letters found on the battlefield confirmed that Colonel "Ussiakou" had been killed along with Colonel "Kakoskau".
It's of course worth mentioning that Russian sources give very different numbers. According to Sheremetev's journal the total loss in dead and wounded at Kasaritsa, Rauge and Rappin was 85 - 23 killed and 62 wounded. Not so easy to reconcile with Schlippenbach's body count, that's for sure.
Riksarkivet, Skrivelser till Konungen. Karl XII, vol. 23
Palli, H., Mezhdu dvumya boyami za Narvu. - Tallinn, 1960