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How about this for the 'inside information' gained by the joint Mirkwood Scouts/Lorien Envoys:
This army has a whole phalanx of the 'new and improved' trolls bred by Sauron that can stand daylight (this much is learned from the freed envoy -- "that sounds terrible, but even though they are tough, one group of trolls alone won't make the difference. . .hmmmm. . .they must be up to something: we should follow them. . .")
As they follow they realise that the orc army is heading for a point along the shore of the Anduin that is uncrossable -- but when they get there (horrors!) they see that the trolls aren't for fighting but for engineering: they are able to construct a floating/pontoon bridge that gets the army across (also with the help of the more sophisticated -- than the orcs at least -- Easterlings).
"Oh no! This army is headed for Lorien from a direction they will never be expecting! We must get across the River -- but how? -- and get ahead of that army -- but how? -- and warn Celeborn!"
As to the Envoy -- how about they aren't heading to Thraduil at all, but to the Woodmen (maybe even Beorn)? They are a lot closer than the Mirkwood kingdom. This envoy then is captured by the easterlings (who are accompanied by a smaller group of orcs, who want to kill them on the spot -- hey, plot stuff there as the Easterlings and orcs argue).
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