Analysis of information sources in references of the Wikipedia article "Batalhão do Sol do Norte" in Portuguese language version.
Adnan al-Ahmad, commander in chief of Shams ash-Shamal brigades which fight in the SDF ranks, said there is a high degree of coordination between the various factions of the SDF.
Today Feb 4, 2016, Martyrs of Dam Brigade (MDB) officially declared their joining of Shams al-Shimal Brigade, which itself is under the SDF umbrella.
