German units in central France (Indre area) in June-July 1940

  • Hi,
    Please what are the German units (Heer) which fought, crossed, occupied South Loire river, in the North of Indre (area of Châteauroux, central France) in June –begining of July 1940 ?
    Any information (books, articles in German or English language, archives etc…) ) would be very welcome.

    Thank you
    Philippe