For Base Defence and Missions:

1) If a soldier kills an enemy, can that same soldier engage a new enemy?

2) If a soldier is killed, can a new soldier attempt to attack that same enemy. If so, would the threat reset (for Base Defence)?

1) yes your soldier can engage another enemy, in fact if you want any chance of clearing the base you have to.

2a) with each roll you can assign any combination of soldiers assigned to base defense that fits the symbols.

2b) Threat does not reset during base defense or attempting the mission. Threat resets AFTER the phase.

Thanks.

As a tactic, would it be best to send a single soldier at a time to attack enemies (once the Threat gets fairly high)?

Thanks.

As a tactic, would it be best to send a single soldier at a time to attack enemies (once the Threat gets fairly high)?

Yeah, the break-even point is about 3 threat - after that, you're better only risking one soldier at a time - the saving comes when you would have rolled more successes than you needed and lost the soldiers at the same time - you actually get slightly fewer successes on average if you roll until you lose all your soldiers one soldier at a time from threat 4 or earlier, but you lose fewer soldiers on average if you roll until you succeed one soldier at a time. Actually, you only start saving once the number of successes you need to roll drops below the number of dice you're rolling, but that happens pretty often.

And, of course, you have the option to give up after losing one soldier rather than going all or nothing - which gives you a much lower chance of success, but significantly reduces your risk.

Thanks for the responses.