how can detect attack from pcap by bro

hello evry one i
I tested bro ids with tcpdump darpa 1999 I imported all the script for the detection,as results i had nodetection all results are about protocol detector ,i tested also suricata with the same tcpdump as results suricata detect large number of attack ,

i want to know how can i use bro for detect attack in the tcp dump to compare the number of attack detected against suricata