 Swedish guns from Riga had continually bombarded the allied entrenchments across the river the same day and would continue doing so throughout the night and landing.After all the troops were embarked, the Swedes first torched some small boats on fire and pushed them out the river to obstruct the view for the allies with the deception (smoke), then at four o'clock in the morning of the 19th, the attack began.During their halfway reach, when the landing boats had gone around the island of Fossenholm (which had effectively blocked the sight of the Swedes), they got discovered and fired at.