Whether there was historical bad blood between the assembled forces or not, they were united in common cause to face an enemy stronger than any of them. Those forces under the command of the Duke of Nordmann carried out their tasks without molestation from the enemy. But that wasn't to say the enemy did not establish pickets themselves. They did not show any signs of aggression, however, and were only deployed to scan for signs of an advance. It seemed that Franciso Marion intended to keep a watch on his opponents, but his army would rest for the night and they would not advance until the following day.
The Allied commanders had all found their way to the central tent. Once the formalities were over they could each explain what their respective forces would do in the coming battle. The map that lay before them was fairly simple. The battlefield would be big enough to fit their entire force comfortably, still allowing room for maneuvers. Additionally they knew the width of the battlefield would allow their artillery - if placed at the top of their ridge - would be able to reach the other side of the valley easily.
Everyone who had faced Emperor in battle might be familiar with his tactics. For starters, he favored grand batteries: deploying the majority of his guns in a single location to wreak havoc on enemy positions. Naturally, the Allies might expect the Emperor to deploy his guns on the top of the eastern ridge.
Next, the Emperor would launch general advances across the enemy lines to determine where it was weak and where it was strong. And where it was weak the Emperor would deploy his Imperial Guards to punch a hole before rolling up the enemy line. The Imperial Guards were handpicked by the Emperor and his Marshals. They were some of the toughest, most experienced, and disciplined troops in the world. When the Imperial Guards advanced they did not stop; no army had ever routed them. Would that change in the Battle of the Nations?
Of course the Emperor did scout and probe the enemy with his cavalry. But in battle their main function was to support the infantry, flanking the enemy lines and exploiting holes where possible. In some cases they were able to plow through formations after the Emperor bombarded the positions with his artillery.
To start, perhaps the Allied officers should determine where they would deploy themselves behind the ridge, because once they crossed the top they would potentially be under fire from enemy artillery.