dumbkoff

Can anyone help, I'm stuck?. Resistance Campaign mode on Hostage level. I sneak up kill all the guards and the hostages escape all ok so far then you recieve the radio message saying the hostages are safe and gain three extra team members. I dont get the next bit what happens next? whatever I do the tanks & bmp arrive and we are all dead?. Whats Next?

I am new to OFP, playing in Resistance multiplayer one of the things I am finding the hardest to master is identifying the other players as friend or foe when servers are in expert mode, and tips would be greatly appriciated?, I will apologise now to all those players I've blown away be mistake!!!!!!!!!.???