The Estonian historian Hendrik Sepp (1888-1943) in 1930 published an extensive study of the siege of Narva in 1700 (Narva piiramine ja lahing a. 1700). Sepp was fortunate to have access to the archives of the Livonian Governor General and the Estonian Governor General, which had not been used by Carl Bennedich and his associates when they prepared the Narva chapter in volume 2 of Karl XII på slagfältet (1918). I have during the last few months obtained copies of most of the Narva related records from the two above-mentioned archives. Although Livonia in 1700 was a vastly more important province than the much smaller Estonia it's the latter archive which is more rewarding in this case. In EAA 1.2.285 (incoming letters July-December 1700) one finds for example:
Carl Gustaf Skytte to A. J. de la Gardie, Dorpat 16 September 1700 (about the unfortunate news which have arrived today from Narva).
Henning Rudolf Horn to C. G. Skytte, Narva 10 September 1700 (attached to the previous letter. Reports the sudden invasion by Russian troops and how they were marching towards Narva).
Skytte to de la Gardie, Dorpat 21 September 1700 (how everything still remains quiet along the border, except for rumours of planned transport of artillery from Pskov to Narva).
A summary of recent reports from Narva, dated Dorpat 20 September 1700 (attached to the previous letter)
Skytte to de la Gardie, Dorpat 25 September 1700 (with a copy of Florian Thilo von Thilau's letter, dated Neuhausen 21 September 1700, which contains a report of news and rumours from Russia)
Colonel Johan Apolloff's undated report about Russian forces having crossed the border.
Skytte to de la Gardie, Dorpat 5 October 1700 (about rumours suggesting that a combined Saxon-Russian force will attack Dorpat)
Apolloff to de la Gardie, dated Nyen 4 September (but has to be October) 1700 (about attempts by Christian Adrian Rosenmüller to get the Ingrian peasants to fight the Russians, the fall of Koporie fortress and rumours that the Czar had told his soldiers to take Narva within three days or be massacred)
Apolloff to de la Gardie, undated (about Rosenmüller's capture during a fight near Koporie and his death a couple of days later).