[RPG] Is it better to dash or dodge across an open field

advantage-and-disadvantageattackdnd-5edodge

Suppose I have to run 300 feet across an open field from one area of full cover to another. The entire time I'm in the open, I will be taking incoming ranged attacks, and I want to minimize the number of attacks that hit me as I cross the field. My speed is 30. I have 2 options:

  1. Take the dodge action each round and move 30 feet per round for 10 rounds, thus facing 10 rounds of attacks at disadvantage.
  2. Take the dash action and move 60 feet each round for 5 rounds, thus facing 5 rounds of attacks without disadvantage.

Which of these 2 options results in fewer attacks hitting me on average? If the answer depends on the roll needed to hit, when is it better to use one or the other? Alternatively, is there a more complex solution using only "basic" actions (i.e. only actions available to an unarmed commoner) that does better than either of the above?

For simplicity, you can assume there is 1 incoming attack per round, although the result should be the same for any number of attacks. You can also assume that all attacks have the same modifier. You can also assume that the attacks are always made within the short range of the weapon, so there is no disadvantage from long range. (For this last point, imagine the 300-foot run is parallel to a wall lined with enough archers to cover the entire path in their short range, or more simply, just imagine a single longbow archer with the sharpshooter feat.) I am not overly concerned with the effect of critical hits, but if you want to take them into account, you can assume that a critical hit deals double the damage of a regular hit (even though this is not true in general).

Best Answer

There's a third option - and it's potentially much better

The other answers have dealt capably with your 1 vs. 2 scenario already. To recap what's been established elsewhere:

  1. Dodge every round - every attack against you has disadvantage
  2. Dash every round - suffer half as many attacks against you

Which is better? It depends on the enemy's likelihood 'to hit'.

But there's another way, a third option that's normally superior to both of these choices - because it allows you to combine both of these benefits together, giving your opponent fewer attacks and disadvantage to being hit simultaneously.

It's pretty simple too, take the Dash action each round but fall prone at the end of every turn, then stand up and Dash again at the beginning of your next turn. Let me explain:

Falling prone is free:

You can drop prone without using any of your speed

While a creature is prone:

[Unless] the attacker is within 5 feet of the creature [...] the attack roll has disadvantage.

Standing up again from prone:

costs an amount of movement equal to half your speed

When you take the Dash action, you:

gain extra movement for the current turn. The increase equals your speed, after applying any modifiers.

So, putting all of that together:

  • On your first turn you take the Dash action and move 60 feet into the open.
  • Then drop prone as a free action.
  • On every subsequent turn you take the Dash action to double your available movement (based on your speed) from 30 ft to 60 ft.
  • Standing up costs you 15 ft of movement (which is half your speed - crucially not half your movement).
  • You can then run the remaining 45 ft before throwing your self prone again as a free action.

This approach gives you the best of both worlds.

Moving 60 ft in the first round and 45 ft every subsequent round will allow you to clear the field in only 6 rounds (by the 7th round, you'll have moved 330 ft and be safe and dry) - just one more than Dashing without falling prone. And, every single one of those six attacks against you will have had disadvantage.

As a minor point (credit to Michael), in a pretty small minority of cases, Dashing and remaining upright will still be the superior tactic. If the archer is practically guaranteed to hit you, as a consequence of your low AC compared to their high attack bonus, then making them roll their attacks at disadvantage will be of no real benefit to you, and you'll just want to get out of there as fast as you possibly can.

What if the attacker readies their attack to trigger once you stand up again?

This is still a win-win for you - with thanks to the commenters (Ryan C. Thompson and Anketam).

  • If the attacker has extra attack or multi-attack they'll lose these additional attacks by choosing to Ready.
  • If they choose a trigger of 'fire when you stand up again', you could just Dash and crawl for thirty feet and they'll have lost the attack entirely.
  • Maybe they get wise to this and next time they choose a trigger of more simply 'fire when you move again' assuming that your first move will be to stand up, but allowing them an attack even if you don't. In that case simply take the Dash action and crawl forward until their triggered attack comes at you, with disadvantage, and then stand up and run afterwards, assuming it makes mathematical sense of your remaining movement to do so.
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