 Complete the following phrase:  The new units first task was to form part of the force at Boulogne for the Napoleons planned invasion of the United Kingdom. They built boats for the force and served in their primary role as an elite unit to bolster naval crews, which often had little training or experience. When the invasion was called off, part of the unit fought in the 1805 Austrian campaign, fighting at Ulm and Austerlitz. Then, in 1806, 102 men from the unit took part in the Prussian campaign, fighting at 