If we must die, let it not be like hogs (1)
The speaker sees no alternative to death, like surrender or escape. This is a very desperate situation.
Making their mock at our accursed lot. (4)
The speaker sees this death as heroic, because death has been handed to him by chance or destiny.
If we must die, O let us nobly die, (5)
These phrases put two opposite feelings together: powerlessness and powerfulness.