Page 206. " one shattered gun and one unicorn were left behind "
 Sadly the Russians did not have mythical creatures fighting on their side. The unicorns were a kind of gun, a cross between a howitzer and a cannon that could fire cannonballs or shells. They were thus named as the barrel tapered towards the end like a unicorn's horn; until 1805 they had unicorns engraved upon them.

For more on Russian artillery, visit this interesting site.

Page 218. " the very latest details of the Emperor Alexander's visit to Potsdam "
Tsar Alexander I of Russia and King Frederick II of Prussia swearing immortal friendship
Public DomainTsar Alexander I of Russia and King Frederick II of Prussia swearing immortal friendship

 The Prussians were reluctant to be drawn fully into the war against Napoleon for a number of reasons, and were firmly engaged in a policy of fence-sitting. From late October to early November 1805 Tsar Alexander I stayed in Potsdam to see if he could push Frederick II towards a more active role in the war.

Prussia was already beginning to move towards this idea after the French violated their treaty by advancing into Prussian territory, and because of increasing international pressure, but the final spur to action was Alexander's visit. Alexander made it clear that he would not leave Prussia until he had extracted a military commitment and an oath of 'immortal friendship' from Frederick.