When Saxon forces crossed the border on the evening of 11 February 1700 and moved towards Riga they came upon the small fort of Kobron, situated just across the river from Riga. The fort was very small and the garrison minimal. The commander Major Conrad von Bildstein reported to Dahlbergh at 1 p.m. on the 12th that he had observed advancing Saxons since 7 a.m. He had not been able to determine the enemy's strength. Bildstein asked for reinforcements and orders how to act. Dahlbergh, who was unwilling to weaken the defense of Riga, immediately replied that Bildstein would have to do the best he could with the men he already had..
The distraught commander wrote back in the evening of the 12th, stating that the fort was weak and the garrison insufficient, but he would with the help of God do his best. However, Bildstein assured Dahlbergh, it was quite impossible for anyone to defend Kobron under the present circumstances. The Saxon infantry had already arrived, he added.
The next day Bildstein gave a frank assessment of the situation. He had at his disposal "41 useless soldiers" who would not be able to fire a single shot and the other 9 could certainly fire once, but before they had been able to reload the enemy would be at their throats. It was a pity that the enemy would get all the beautiful ammunition stored at Kobron. The Saxon cavalry and artillery had passed the fort, Bildstein added.
In the night between the 13th and 14th the Saxons forces attacked Kobron and captured it after a short fight.
Source: Riksarkivet, Stockholm, M 1374 (Account of the attack on Riga written by Dahlbergh's secretary Blåman. Several reports by Bildstein are attached.)