Courageous and determined
The lines are explaining how even though our hearts are beating, they are beating us all the way to the grave. The heart beat is compared to the rhythm of a funeral march with everyone stepping in time. The lines are showing hearts are beating courageously and with determination all the way to the person's death, which is inevitable.
"death, desolation, and tyranny"
Hope this helpes:)
When I revise, I go through my paper and highlight all the mistakes that I can, using a different color for each kind. Then after I have done that, I just go through and fix them. It helps the revision go quicker and be more manageable.
A seveal times he stumbled,and finally he tottered,crumbled up,and fell