fleet crashing or f/c for short is when a player attacks somebody to destroy all the defenders fleet and put as much resources in the DF as you can so that you harvest them
to fleet crash first you must find a defender with a fair amount of fleetthen attack him with 1 esponage probe so that theres resources in his DF then attack him and send out your recyclers to reach his DF shortly after the attack so that you harvest his DF
one thing to remember is that theres always a chance of the defender getting a moon and if that happens then unfortunately for you there will be nothing left in his DF
to fleet crash first you must find a defender with a fair amount of fleetthen attack him with 1 esponage probe so that theres resources in his DF then attack him and send out your recyclers to reach his DF shortly after the attack so that you harvest his DF
one thing to remember is that theres always a chance of the defender getting a moon and if that happens then unfortunately for you there will be nothing left in his DF