Horrible winter confusion

I've managed to tie myself into worse knots than before in trying to re-establish my intended chronology for the d'Artois expedition. Reading what I've written it appears the plan for the expedition was as follows:

• Arrive midsummer Year 1
  Send supply ship Amélie back to Norway to report safe arrival of expedition
  
• Midsummer Year 2: return of supply ship to replenish provisions and allow for a change of personnel
  
• Midsummer Year 3: expedition due to return to Paris
  

What actually happens:

• Winter Year 1/2: overwinter as planned
  
• Summer Year 2: supply ship fails to arrive (and Raoul confirms 'over a year later' that the initial report failed to reach Paris)
  
• Winter Year 2/3: overwinter on short rations in the hopes of rescue in summer of Year 3
  
• Spring Year 3: vain attempt to reach Greenland across the ice. No ship arrives "in what remained of the year" after the venturers return.
  
• Midsummer Year 4(?): Wreck of the "Requin"
  

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