Siege of Sternz

This is Madness!
King Dylenn slammed his fist now on the map of his kingdom and demanded an answer. "The war has raged for 15 years. We've always been able to hold them back. Why should we now allow them to besiege our capitol?"
"Because we are outnumbered three to one," explained his commanding general, Izak. "A battle in the open field would be suicide. But here, at Sternz, we have the most defensible city in Aclia. Our outer walls are sturdy. Our inner walls have never been breached.
"75,000 battle-tested warriors are sworn to defend this city - to the death. Loyal troops have joined forces with us from throughout the kingdom of Crixaria and volunteers have come from the other three human kingdoms.
"And we have one more weapon - a new type of fighting unit - five, hand-picked warriors, experts in the profession of arms, skilled in unconventional tactics, capable of standing where larger forces fall.
"They are The Unbroken.
"I promise you, my king, the city will not fall."