First scenario: The Elves Besieged. Get your leader (Konrad) from the middle of the map to the top left, while 3 Orc armies try to stop you. I got lucky with recruiting, getting 2 Elvish Shamans with dextrous (bonus ranged damage), ditto for the Elvish Archers, and 2 Elvish Fighters with strong (bonus melee damage). My target for this level: Level up Konrad to Commander, and at least one other unit.
Delfador was my only powerhouse of 14-4 Fire (x-y means y hits of x damage) , but was slow through the thick forest, and caught up only when I went after the level 3 Orc Warlord leader. For the 2 northern Orcs, they ran out of gold and stopped recruiting after 1 or 2 turns, but their recruits more or less all got stolen by the western Elves, so experience was scarce. Thankfully, I nabbed both leader kills (the south one is too powerful) even though "allied" forces surrounded them first. Finished early by 2 turns.
Turn 6: A skirmish. I don't look too good here (my troops have non-blue orbs above the green health bar.) Already, I lost one Shaman.
Turn 9: I managed to grab this leader kill despite my "allied" level 2 Ranger and level 1 Fighter and Archer. Konrad is now a Commander with leadership, which boosts adjacent lower-leveled units' damage.
Turn 14: Success in the east. The second leader is mine too, and my Archer is now incredibly close to levelling. Now I have a strong, dextrous Archer, Commander Konrad, and a bunch of units with good traits that I'd ideally like to level up in the next scenario (if I don't get KSed again.)
Thus ends the first scenario. An interesting sample of Wesnoth. Update: I've finished the campaign on Medium (far easier than Easy...) and will look into doing something with this dead wood blog. Don't hold your breath...