What is the fine-grained topic of the following text: Brigadier-General H. G. Wright, lately commanding this department, being about to take his departure for the East, the commanding general wishes to publicly express to him his thanks for his cordial co-operation in the movements of this command, and for the assistance he has received from his clear and thorough knowledge of the various interests of the department. Only return the topic.
Public appreciation for Brigadier-General H. G. Wright's contributions in a military department.