In Swedish history books it's often stated that the news about the Saxon attack on Riga reached Charles XII through a courier sent by Governor General Dahlbergh. This was long ago proven to be wrong (see my blog entry for 6 December 2012). Because of some incoming letters in the archive of the Estonian Governor General it is possible to follow the "winner", Captain Otto Magnus Wolffelt a bit further.
On 7 March 1700 Charles XII sent out his first orders for the mobilization of the army. The daring Wolffelt was given the task of bringing the orders to Finland. On 19 March Johan Ribbing, commander of the Nyland and Tavastehus cavalry regiment, wrote to Governor General de la Gardie that he had just received the King's orders through Captain Wolffelt. Captain Brask seems to have been far behind - on 24 April 1700 Otto Vellingk informed Charles XII that Brask had arrived in Reval on the 19th with the King's letter dated 29 March.
EAA (Tartu), EAA 1.2.284
Riksarkivet (Stockholm), Livonica II, vol. 192