My first theory is that angelo bronte gave milton a tip off as to where the location of the gang and probably gave an idea as to what the gang were doing in st denis. My secound theory is that due to the gangs recklessness (the trolly station hiest the riverboat hiest the death of angelo bronte) milton put two and two together. My third theory is that milton who isnt dumb probably deduced that the gang ran to st denis and seeing the opitunity to possibly kill arthur hosea or dutch or all three he floods the city with pinkertons in not so obvious way as to not alarm the gang members of the setup they were planning. I would like to here your guys opinions on my theorys.