the Lazarević brother's crossing; I think just "Vuk's crossing" is enough
Süleyman sent one of his commanders to monitor Branković,[4] to ensure that he was truly loyal; What was the result? What did the commander report regarding Branković's loyalty?
Section 3;
stay "as" a "good shepherd of the flock"
As he was unable to resist Branković's pressure, it was Lazarević who decided the battle; this sentence is a bit vague, I suggest you to reword it
:Excellent article, very well written. I am very much impressed with the style and the flow the article is in. Good work.
With a lot of POV and source-related issues, the article is far away from the GA criteria. Request the nominator to first resolve the issues on talk page and renominate the article after the improvements. Regards, Krishna Chaitanya Velaga (talk • mail) 04:21, 25 April 2017 (UTC)[reply]
GA review (see here for what the criteria are, and here for what they are not)