As I understand it Pioneer units build bailey bridges etc so the army can get to where it wants to go. One way of proectng a ciity etc is to blow up the bridges, raods etc as you retreat so the on coming Army cant get though. WW2 a number of bridges around the Hawkesbury to th north of Sydney were blown up or were ready to be blown up if Japanese landed, Elizabeth ----- Original Message ----- From: <[email protected]> To: <[email protected]> Sent: Tuesday, December 31, 2002 8:47 AM Subject: AUS-MILITARY-D Digest V02 #207