Create a new mission, create two soldiers on the map, name the one that's not under player control - "Man1", in the init line of this unit add grp1 = group this; save the mission.

In the mission folder create kb subdirectory.
In this directory create a file named mission.bikb with this:

class Sentences
{
class FollowMe
{
text = "All, follow me!";
speech[] = {"ReturnToFormation"};
actor = "grp1";
variant = "";
variantText = "";
};
};
class Arguments{};
class Special{};
startWithVocal[] = {hour};
startWithConsonant[] = {europe, university};

Create a init.sqf script

sleep 3;
man1 kbAddTopic ["mission", "kb\mission.bikb"];
sleep 3;
man1 kbTell [player, "mission", "FollowMe"];

Run the mission and enjoy the crash.