The following is a direct translation from the classical genealogical and heraldic reference "Herbarz Polski" by Kasper Niesiecki, S. J., Lipsk edition, 1839-1846.
There are two handguards, such as are used in Bohemia, in the form of the letter "S," put together as a cross on a red field, and on the helm are three ostrich feathers. In fact, this is the Korsak coat of arms. These arms were granted to one of our compatriots on an occasion (as Paprocki says) when he acquitted himself manfully in a battle with the Czechs; others say that the arms were brought to Poland from Bohemia. The Bronickis near Olyka in Volhynia use these arms. I have not read more about them. Paprocki, Gniazdo, fol. 1131, 0 herbach, fol. 678. Okolski, Vol. 1, fol. 92. Liber Klejn, fol. 42. MS. P. Rutka.
[From Wieladko's Heraldyka]: Bronic - Ignacy of Bronic arms, cupbearer and judge of the Vehmgericht in Wilno province, signed the act of general confederation of the Grand Duchy of Lithuania in 1764. Adam Bronic, Vehmgericht judge and envoy of Wilno province, Petyhorski standard-bearer, signed to the election of King Stanislaw August from Wilno province.
Copyright © 1992 William F. Hoffman. Used by permission. This article originally appeared in Polish Genealogical Society Newsletter (Vol. XV, No. 1, Spring 1992), the bulletin of the Polish Genealogical Society.