anchor: Osman Gazi's son, Orhan, captured Bursa in 1326, and set up his capital there, then moved it to Adrianople (Edirne), which he took in 1361.
positive: Bursa was captured by Orhan, the son of Osman Gazi, and mad into the capital.
negative: Orhan's attack was easily repelled by Bursa's defenders.