 Complete the following phrase:  With the retirement of admiral Ulrich Anton Schønheyder from the admiralty college in 1846, Schifter took over as a deputy head  a post he served for two years. He was newly advanced to second in command of the navy but left shortly afterwards to become chief of the naval dockyards overekvipagemester . In this position he found himself leading the naval mobilisation for the war of 1848 -50 